diff --git a/Test/baseResults/matrix.frag.out b/Test/baseResults/matrix.frag.out
index f3bea4b22..5fd4eb67d 100644
--- a/Test/baseResults/matrix.frag.out
+++ b/Test/baseResults/matrix.frag.out
@@ -242,6 +242,36 @@ Shader version: 130
 0:54              'un34' ( uniform 4X4 matrix of float)
 0:54              'um43' ( uniform 4X4 matrix of float)
 0:54            'v' ( smooth in 4-component vector of float)
+0:56      Sequence
+0:56        move second child to first child ( temp 4X2 matrix of float)
+0:56          'm42' ( temp 4X2 matrix of float)
+0:56          Constant:
+0:56            42.000000
+0:56            0.000000
+0:56            0.000000
+0:56            42.000000
+0:56            0.000000
+0:56            0.000000
+0:56            0.000000
+0:56            0.000000
+0:57      Test condition and select ( temp void)
+0:57        Condition
+0:57        Compare Equal ( temp bool)
+0:57          'm42' ( temp 4X2 matrix of float)
+0:57          Constant:
+0:57            42.000000
+0:57            0.000000
+0:57            0.000000
+0:57            42.000000
+0:57            0.000000
+0:57            0.000000
+0:57            0.000000
+0:57            0.000000
+0:57        true case
+0:58        Sequence
+0:58          add second child into first child ( temp 4-component vector of float)
+0:58            'gl_FragColor' ( fragColor 4-component vector of float FragColor)
+0:58            'v' ( smooth in 4-component vector of float)
 0:?   Linker Objects
 0:?     'colorTransform' ( uniform 3X3 matrix of float)
 0:?     'Color' ( smooth in 3-component vector of float)
@@ -495,6 +525,36 @@ Shader version: 130
 0:54              'un34' ( uniform 4X4 matrix of float)
 0:54              'um43' ( uniform 4X4 matrix of float)
 0:54            'v' ( smooth in 4-component vector of float)
+0:56      Sequence
+0:56        move second child to first child ( temp 4X2 matrix of float)
+0:56          'm42' ( temp 4X2 matrix of float)
+0:56          Constant:
+0:56            42.000000
+0:56            0.000000
+0:56            0.000000
+0:56            42.000000
+0:56            0.000000
+0:56            0.000000
+0:56            0.000000
+0:56            0.000000
+0:57      Test condition and select ( temp void)
+0:57        Condition
+0:57        Compare Equal ( temp bool)
+0:57          'm42' ( temp 4X2 matrix of float)
+0:57          Constant:
+0:57            42.000000
+0:57            0.000000
+0:57            0.000000
+0:57            42.000000
+0:57            0.000000
+0:57            0.000000
+0:57            0.000000
+0:57            0.000000
+0:57        true case
+0:58        Sequence
+0:58          add second child into first child ( temp 4-component vector of float)
+0:58            'gl_FragColor' ( fragColor 4-component vector of float FragColor)
+0:58            'v' ( smooth in 4-component vector of float)
 0:?   Linker Objects
 0:?     'colorTransform' ( uniform 3X3 matrix of float)
 0:?     'Color' ( smooth in 3-component vector of float)
diff --git a/Test/matrix.frag b/Test/matrix.frag
index 150e0434f..afafa3493 100644
--- a/Test/matrix.frag
+++ b/Test/matrix.frag
@@ -1,55 +1,60 @@
-#version 130
-
-//#define TEST_POST_110
-
-uniform mat3 colorTransform;
-varying vec3 Color;
-uniform mat4 m, n;
-
-#ifdef TEST_POST_110
-uniform mat4x3 um43;
-uniform mat3x4 un34;
-#else
-uniform mat4 um43;
-uniform mat4 un34;
-#endif
-
-varying vec4 v;
-
-#ifdef TEST_POST_110
-varying vec3 u;
-#else
-varying vec4 u;
-#endif
-
-void main()
-{
-    gl_FragColor = vec4(un34[1]);
-    gl_FragColor += vec4(Color * colorTransform, 1.0);
-
-    if (m != n)
-        gl_FragColor += v;
-   else {
-        gl_FragColor += m * v;
-        gl_FragColor += v * (m - n);
-   }
-    
-#ifdef TEST_POST_110
-    mat3x4 m34 = outerProduct(v, u);
-    m34 += mat4(v.x);
-    m34 += mat4(u, u.x, u, u.x, u, u.x, u.x);
-#else
-    mat4 m34 = mat4(v.x*u.x, v.x*u.y, v.x*u.z, v.x*u.w, 
-                    v.y*u.x, v.y*u.y, v.y*u.z, v.y*u.w, 
-                    v.z*u.x, v.z*u.y, v.z*u.z, v.z*u.w, 
-                    v.w*u.x, v.w*u.y, v.w*u.z, v.w*u.w);
-    m34 += mat4(v.x);
-    m34 += mat4(u, u.x, u, u.x, u, u.x, u.x);
-
-#endif
-
-    if (m34 == un34)
-        gl_FragColor += m34 * u;
-    else
-        gl_FragColor += (un34 * um43) * v;
-}
+#version 130
+
+//#define TEST_POST_110
+
+uniform mat3 colorTransform;
+varying vec3 Color;
+uniform mat4 m, n;
+
+#ifdef TEST_POST_110
+uniform mat4x3 um43;
+uniform mat3x4 un34;
+#else
+uniform mat4 um43;
+uniform mat4 un34;
+#endif
+
+varying vec4 v;
+
+#ifdef TEST_POST_110
+varying vec3 u;
+#else
+varying vec4 u;
+#endif
+
+void main()
+{
+    gl_FragColor = vec4(un34[1]);
+    gl_FragColor += vec4(Color * colorTransform, 1.0);
+
+    if (m != n)
+        gl_FragColor += v;
+   else {
+        gl_FragColor += m * v;
+        gl_FragColor += v * (m - n);
+   }
+
+#ifdef TEST_POST_110
+    mat3x4 m34 = outerProduct(v, u);
+    m34 += mat4(v.x);
+    m34 += mat4(u, u.x, u, u.x, u, u.x, u.x);
+#else
+    mat4 m34 = mat4(v.x*u.x, v.x*u.y, v.x*u.z, v.x*u.w,
+                    v.y*u.x, v.y*u.y, v.y*u.z, v.y*u.w,
+                    v.z*u.x, v.z*u.y, v.z*u.z, v.z*u.w,
+                    v.w*u.x, v.w*u.y, v.w*u.z, v.w*u.w);
+    m34 += mat4(v.x);
+    m34 += mat4(u, u.x, u, u.x, u, u.x, u.x);
+
+#endif
+
+    if (m34 == un34)
+        gl_FragColor += m34 * u;
+    else
+        gl_FragColor += (un34 * um43) * v;
+
+    mat4x2 m42 = mat4x2(42);
+    if (m42 == mat4x2(42, 0, 0, 42, 0, 0, 0, 0)) {
+        gl_FragColor += v;
+    }
+}
diff --git a/glslang/MachineIndependent/parseConst.cpp b/glslang/MachineIndependent/parseConst.cpp
index 7c04743ba..6c182991f 100644
--- a/glslang/MachineIndependent/parseConst.cpp
+++ b/glslang/MachineIndependent/parseConst.cpp
@@ -166,31 +166,30 @@ void TConstTraverser::visitConstantUnion(TIntermConstantUnion* node)
                 }
             } else {
                 // matrix from vector or scalar
-                int count = 0;
-                const int startIndex = index;
                 int nodeComps = node->getType().computeNumComponents();
-                for (int i = startIndex; i < endIndex; i++) {
-                    if (i >= instanceSize)
-                        return;
-                    if (nodeComps == 1) {
-                        // If there is a single scalar parameter to a matrix
-                        // constructor, it is used to initialize all the
-                        // components on the matrix's diagonal, with the
-                        // remaining components initialized to 0.0.
-                        if (i == startIndex || (i - startIndex) % (matrixRows + 1) == 0 )
-                            leftUnionArray[i] = rightUnionArray[count];
-                        else
-                            leftUnionArray[i].setDConst(0.0);
-                    } else {
+                if (nodeComps == 1) {
+                    for (int c = 0; c < matrixCols; ++c) {
+                        for (int r = 0; r < matrixRows; ++r) {
+                            if (r == c)
+                                leftUnionArray[index] = rightUnionArray[0];
+                            else
+                                leftUnionArray[index].setDConst(0.0);
+                            index++;
+                        }
+                    }
+                } else {
+                    int count = 0;
+                    for (int i = index; i < endIndex; i++) {
+                        if (i >= instanceSize)
+                            return;
+
                         // construct the matrix in column-major order, from
                         // the components provided, in order
                         leftUnionArray[i] = rightUnionArray[count];
-                    }
 
-                    index++;
-
-                    if (nodeComps > 1)
+                        index++;
                         count++;
+                    }
                 }
             }
         }