diff --git a/contrib/plugins/drcov.c b/contrib/plugins/drcov.c
index 686ae0a537dccabc23e1acc797ba736e0b315c6b..5edc94dcaf61bb4d026f34be3d3787e598fa2f72 100644
--- a/contrib/plugins/drcov.c
+++ b/contrib/plugins/drcov.c
@@ -48,7 +48,7 @@ static void printf_header(unsigned long count)
     uint64_t start_code = qemu_plugin_start_code();
     uint64_t end_code = qemu_plugin_end_code();
     uint64_t entry = qemu_plugin_entry_code();
-    fprintf(fp, "0, 0x%lx, 0x%lx, 0x%lx, %s\n",
+    fprintf(fp, "0, 0x%" PRIx64 ", 0x%" PRIx64 ", 0x%" PRIx64 ", %s\n",
             start_code, end_code, entry, path);
     fprintf(fp, "BB Table: %ld bbs\n", count);
 }