diff --git a/flang/test/Semantics/test_symbols.py b/flang/test/Semantics/test_symbols.py
index 24dc5004a4229..aca55acc8d402 100755
--- a/flang/test/Semantics/test_symbols.py
+++ b/flang/test/Semantics/test_symbols.py
@@ -29,7 +29,7 @@
 # Strips out blank lines and all comments except for "!DEF:", "!REF:", "!$acc" and "!$omp"
 with open(src, "r") as text_in:
     for line in text_in:
-        text = re.sub(r"!(?![DR]EF:|\$omp|\$acc).*", "", line)
+        text = re.sub(r"!(?![DR]EF:|\$omp|\$acc).*", "", line, re.I)
         text = re.sub(r"^\s*$", "", text)
         diff1 += text