diff --git a/src/lib/blit.c b/src/lib/blit.c
index 302eacaa2..1a09cc540 100644
--- a/src/lib/blit.c
+++ b/src/lib/blit.c
@@ -1,4 +1,5 @@
 #include <stddef.h>
+#include <inttypes.h>
 #include "internal.h"
 
 static const uint32_t zeroes32;
@@ -1037,7 +1038,7 @@ int ncblit_rgb_packed(const void* data, int linesize,
 
 int ncblit_rgba(const void* data, int linesize, const struct ncvisual_options* vopts){
   if(vopts->flags > NCVISUAL_OPTION_BLEND){
-    fprintf(stderr, "Warning: unknown ncvisual options %016jx\n", (uintmax_t)vopts->flags);
+    fprintf(stderr, "Warning: unknown ncvisual options %016" PRIx64 "\n", (uintmax_t)vopts->flags);
   }
   if(linesize <= 0 || (size_t)linesize < vopts->lenx * sizeof(uint32_t)){
     return -1;