diff --git a/op_reg_common.h b/op_reg_common.h
index e8770e6352e9..1273cb6f2195 100644
--- a/op_reg_common.h
+++ b/op_reg_common.h
@@ -101,8 +101,20 @@ get_regex_charset(const U32 flags)
 
 /* Mask of the above bits.  These need to be transferred from op_pmflags to
  * re->extflags during compilation */
-#define RXf_PMf_COMPILETIME    (RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_FOLD|RXf_PMf_EXTENDED|RXf_PMf_EXTENDED_MORE|RXf_PMf_KEEPCOPY|RXf_PMf_NOCAPTURE|RXf_PMf_CHARSET|RXf_PMf_STRICT)
-#define RXf_PMf_FLAGCOPYMASK   (RXf_PMf_COMPILETIME|RXf_PMf_SPLIT)
+#define RXf_PMf_COMPILETIME \
+    ( RXf_PMf_MULTILINE     \
+    | RXf_PMf_SINGLELINE    \
+    | RXf_PMf_FOLD          \
+    | RXf_PMf_EXTENDED      \
+    | RXf_PMf_EXTENDED_MORE \
+    | RXf_PMf_KEEPCOPY      \
+    | RXf_PMf_NOCAPTURE     \
+    | RXf_PMf_CHARSET       \
+    | RXf_PMf_STRICT )
+
+#define RXf_PMf_FLAGCOPYMASK    \
+    ( RXf_PMf_COMPILETIME       \
+    | RXf_PMf_SPLIT )
 
 /* Temporary to get Jenkins happy again
  * See thread starting at http://nntp.perl.org/group/perl.perl5.porters/220710