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-rw-r--r--src/src/exim.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/src/exim.c b/src/src/exim.c
index 670319b98..a6c0d7832 100644
--- a/src/src/exim.c
+++ b/src/src/exim.c
@@ -973,7 +973,9 @@ DEBUG(D_any) do {
* unless its an ancient version of PCRE in which case it
* is not defined */
#ifdef PCRE_PRERELEASE
- PCRE_PRERELEASE "",
+# define STRINGIFY(x) #x
+ STRINGIFY(PCRE_PRERELEASE) "",
+# undef STRINGIFY
#else
"",
#endif