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-rw-r--r--contrib/flex/src/scan.l2
1 files changed, 1 insertions, 1 deletions
diff --git a/contrib/flex/src/scan.l b/contrib/flex/src/scan.l
index 1570f505b342..d01406ecdd4a 100644
--- a/contrib/flex/src/scan.l
+++ b/contrib/flex/src/scan.l
@@ -705,7 +705,7 @@ M4QEND "]""]"
}
nmstr[yyleng - 2 - end_is_ws] = '\0'; /* chop trailing brace */
- if ( (nmdefptr = ndlookup( nmstr )) == 0 )
+ if ( (nmdefptr = ndlookup( nmstr )) == NULL )
format_synerr(
_( "undefined definition {%s}" ),
nmstr );