diff --git a/src/sksl/codegen/SkSLGLSLCodeGenerator.cpp b/src/sksl/codegen/SkSLGLSLCodeGenerator.cpp
index cb2beaa949..5aeecf1d3e 100644
--- a/src/sksl/codegen/SkSLGLSLCodeGenerator.cpp
+++ b/src/sksl/codegen/SkSLGLSLCodeGenerator.cpp
@@ -495,10 +495,9 @@ void GLSLCodeGenerator::writeFunctionCall(const FunctionCall& c) {
             break;
         case k_dFdy_IntrinsicKind:
             // Flipping Y also negates the Y derivatives.
-            this->write("(" SKSL_RTFLIP_NAME ".y * dFdy(");
-            this->writeExpression(*arguments[0], Precedence::kSequence);
-            this->write("))");
-            return;
+            this->write(SKSL_RTFLIP_NAME ".y * dFdy");
+            nameWritten = true;
+            [[fallthrough]];
         case k_dFdx_IntrinsicKind:
         case k_fwidth_IntrinsicKind:
             if (!fFoundDerivatives &&
diff --git a/src/sksl/codegen/SkSLMetalCodeGenerator.cpp b/src/sksl/codegen/SkSLMetalCodeGenerator.cpp
index fe21c1958d..67d789fc3a 100644
--- a/src/sksl/codegen/SkSLMetalCodeGenerator.cpp
+++ b/src/sksl/codegen/SkSLMetalCodeGenerator.cpp
@@ -717,9 +717,8 @@ bool MetalCodeGenerator::writeIntrinsicCall(const FunctionCall& c, IntrinsicKind
             return true;
         }
         case k_dFdy_IntrinsicKind: {
-            this->write("(" + fRTFlipName + ".y * dfdy");
+            this->write(fRTFlipName + ".y*dfdy");
             this->writeArgumentList(c.arguments());
-            this->write(")");
             return true;
         }
         case k_inverse_IntrinsicKind: {
diff --git a/tests/sksl/intrinsics/DFdy.glsl b/tests/sksl/intrinsics/DFdy.glsl
index 13f7fd2634..1ea763a838 100644
--- a/tests/sksl/intrinsics/DFdy.glsl
+++ b/tests/sksl/intrinsics/DFdy.glsl
@@ -6,5 +6,5 @@ uniform vec4 colorGreen;
 uniform vec4 colorRed;
 vec4 main() {
     vec4 expected = vec4(0.0);
-    return ((((((u_skRTFlip.y * dFdy(testInputs.x)) == expected.x && (u_skRTFlip.y * dFdy(testInputs.xy)) == expected.xy) && (u_skRTFlip.y * dFdy(testInputs.xyz)) == expected.xyz) && (u_skRTFlip.y * dFdy(testInputs)) == expected) && sign((u_skRTFlip.y * dFdy(coords.xx))) == vec2(0.0, 0.0)) && sign((u_skRTFlip.y * dFdy(coords.yy))) == vec2(1.0, 1.0)) && sign((u_skRTFlip.y * dFdy(coords))) == vec2(0.0, 1.0) ? colorGreen : colorRed;
+    return (((((u_skRTFlip.y * dFdy(testInputs.x) == expected.x && u_skRTFlip.y * dFdy(testInputs.xy) == expected.xy) && u_skRTFlip.y * dFdy(testInputs.xyz) == expected.xyz) && u_skRTFlip.y * dFdy(testInputs) == expected) && sign(u_skRTFlip.y * dFdy(coords.xx)) == vec2(0.0, 0.0)) && sign(u_skRTFlip.y * dFdy(coords.yy)) == vec2(1.0, 1.0)) && sign(u_skRTFlip.y * dFdy(coords)) == vec2(0.0, 1.0) ? colorGreen : colorRed;
 }
diff --git a/tests/sksl/intrinsics/DFdy.metal b/tests/sksl/intrinsics/DFdy.metal
index 8f4e8b8472..2d473c4d81 100644
--- a/tests/sksl/intrinsics/DFdy.metal
+++ b/tests/sksl/intrinsics/DFdy.metal
@@ -18,6 +18,6 @@ fragment Outputs fragmentMain(Inputs _in [[stage_in]], constant Uniforms& _unifo
     Outputs _out;
     (void)_out;
     float4 expected = float4(0.0);
-    _out.sk_FragColor = ((((((_anonInterface0.u_skRTFlip.y * dfdy(_uniforms.testInputs.x)) == expected.x && all((_anonInterface0.u_skRTFlip.y * dfdy(_uniforms.testInputs.xy)) == expected.xy)) && all((_anonInterface0.u_skRTFlip.y * dfdy(_uniforms.testInputs.xyz)) == expected.xyz)) && all((_anonInterface0.u_skRTFlip.y * dfdy(_uniforms.testInputs)) == expected)) && all(sign((_anonInterface0.u_skRTFlip.y * dfdy(coords.xx))) == float2(0.0, 0.0))) && all(sign((_anonInterface0.u_skRTFlip.y * dfdy(coords.yy))) == float2(1.0, 1.0))) && all(sign((_anonInterface0.u_skRTFlip.y * dfdy(coords))) == float2(0.0, 1.0)) ? _uniforms.colorGreen : _uniforms.colorRed;
+    _out.sk_FragColor = (((((_anonInterface0.u_skRTFlip.y*dfdy(_uniforms.testInputs.x) == expected.x && all(_anonInterface0.u_skRTFlip.y*dfdy(_uniforms.testInputs.xy) == expected.xy)) && all(_anonInterface0.u_skRTFlip.y*dfdy(_uniforms.testInputs.xyz) == expected.xyz)) && all(_anonInterface0.u_skRTFlip.y*dfdy(_uniforms.testInputs) == expected)) && all(sign(_anonInterface0.u_skRTFlip.y*dfdy(coords.xx)) == float2(0.0, 0.0))) && all(sign(_anonInterface0.u_skRTFlip.y*dfdy(coords.yy)) == float2(1.0, 1.0))) && all(sign(_anonInterface0.u_skRTFlip.y*dfdy(coords)) == float2(0.0, 1.0)) ? _uniforms.colorGreen : _uniforms.colorRed;
     return _out;
 }