Correct type for isalnum

diff --git a/contrib/ltree/ltree.h b/contrib/ltree/ltree.h
index c732a37fa2dd287c632decfc302615025769b779..edcda22e4b965c999713ebb854ea464a81c20922 100644 (file)
--- a/contrib/ltree/ltree.h
+++ b/contrib/ltree/ltree.h
@@ -87,7 +87,7 @@ typedef struct
 #ifndef abs
 #define abs(a)                                 ((a) <  (0) ? -(a) : (a))
 #endif
-#define ISALNUM(x)     ( isalnum((unsigned int)(x)) || (x) == '_' )
+#define ISALNUM(x)     ( isalnum((unsigned char)(x)) || (x) == '_' )
 
 /* full text query */