diff --git a/src/target/mips_m4k.h b/src/target/mips_m4k.h
index bb37ee2d4..85d4c0a5c 100644
--- a/src/target/mips_m4k.h
+++ b/src/target/mips_m4k.h
@@ -31,7 +31,7 @@ struct target;
 
 struct mips_m4k_common
 {
-	int common_magic;
+	uint32_t common_magic;
 	bool is_pic32mx;
 	struct mips32_common mips32;
 };