diff --git a/linker/linker.cpp b/linker/linker.cpp
index 506c3f2..04ffe59 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -856,7 +856,7 @@
     return NULL;
   }
   if (extinfo != NULL && ((extinfo->flags & ~(ANDROID_DLEXT_VALID_FLAG_BITS)) != 0)) {
-    DL_ERR("invalid extended flags to android_dlopen_ext: %x", extinfo->flags);
+    DL_ERR("invalid extended flags to android_dlopen_ext: %" PRIx64, extinfo->flags);
     return NULL;
   }
   protect_data(PROT_READ | PROT_WRITE);