diff --git a/libgomp/testsuite/libgomp.c/reverse-offload-sm30.c b/libgomp/testsuite/libgomp.c/reverse-offload-sm30.c
index 7f10fd4ded9..cae75f03462 100644
--- a/libgomp/testsuite/libgomp.c/reverse-offload-sm30.c
+++ b/libgomp/testsuite/libgomp.c/reverse-offload-sm30.c
@@ -12,4 +12,7 @@ main ()
   return 0;
 }
 
+/* The 'mkoffload's currently don't obey '-fno-diagnostics-color' etc., so use a different way to effect the same thing:
+   { dg-set-compiler-env-var GCC_COLORS "" }
+   ..., so that the following regexp doesn't have to deal with color code escape sequences.  */
 /* { dg-warning "'omp requires reverse_offload' requires at least 'sm_35' for '-foffload-options=nvptx-none=-march=' - disabling offload-code generation for this device type" "" { target *-*-* } 0 } */