1 files changed, 1 insertions, 1 deletions

diff --git a/zutil.h b/zutil.h
index 24ab06b..3b761d3 100644
--- a/zutil.h
+++ b/zutil.h
@@ -216,7 +216,7 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
 #endif
 
 /* Diagnostic functions */
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
 #  include <stdio.h>
    extern int ZLIB_INTERNAL z_verbose;
    extern void ZLIB_INTERNAL z_error OF((char *m));