diff --git a/flang/test/Semantics/altreturn04.f90 b/flang/test/Semantics/altreturn04.f90
--- a/flang/test/Semantics/altreturn04.f90
+++ b/flang/test/Semantics/altreturn04.f90
@@ -2,6 +2,6 @@
 ! Functions cannot use alt return
 
 REAL FUNCTION altreturn01(X)
-!ERROR: RETURN with expression is only allowed in SUBROUTINE subprogram
+! ERROR: RETURN with expression is only allowed in SUBROUTINE subprogram
   RETURN 1
 END
diff --git a/flang/test/Semantics/test_errors.py b/flang/test/Semantics/test_errors.py
--- a/flang/test/Semantics/test_errors.py
+++ b/flang/test/Semantics/test_errors.py
@@ -49,7 +49,7 @@
 # Gets the expected errors and their line number
 errors = []
 for i, line in enumerate(src, 1):
-    m = re.search(r"(?:^\s*!ERROR: )(.*)", line)
+    m = re.search(r"(?:^\s*!\s*ERROR: )(.*)", line)
     if m:
         errors.append(m.group(1))
         continue