diff --git a/contrib/zlib/gzwrite.c b/contrib/zlib/gzwrite.c
index 5e1d53949..3ed161f44 100644
--- a/contrib/zlib/gzwrite.c
+++ b/contrib/zlib/gzwrite.c
@@ -351,10 +351,10 @@ int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
 #  endif
 #else
 #  ifdef HAS_vsnprintf_void
-    (void)vai_snprintf((char *)(state->in), size, format, va);
+    (void)vsnprintf((char *)(state->in), size, format, va);
     len = strlen((char *)(state->in));
 #  else
-    len = vai_snprintf((char *)(state->in), size, format, va);
+    len = vsnprintf((char *)(state->in), size, format, va);
 #  endif
 #endif
 
@@ -438,11 +438,11 @@ int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
 #  endif
 #else
 #  ifdef HAS_snprintf_void
-    ai_snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8,
+	snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8,
              a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
     len = strlen((char *)(state->in));
 #  else
-    len = ai_snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6,
+    len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6,
                    a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18,
                    a19, a20);
 #  endif