diff --git a/configure b/configure
index 9366022d39..d3d2ecc03b 100755
--- a/configure
+++ b/configure
@@ -18263,7 +18263,8 @@ else
             }
             int main()
             {
-                return foo("hi", 17);
+                foo("hi", 17);
+                return 0;
             }
 _ACEOF
 rm -f conftest.$ac_objext conftest$ac_exeext
diff --git a/configure.in b/configure.in
index d3a3fd1616..3c0ab647ac 100644
--- a/configure.in
+++ b/configure.in
@@ -1740,7 +1740,8 @@ AC_CACHE_CHECK([for va_copy],
             }
             int main()
             {
-                return foo("hi", 17);
+                foo("hi", 17);
+                return 0;
             }],
             wx_cv_func_va_copy=yes,
             wx_cv_func_va_copy=no