diff --git a/qemu/target/mips/translate.c b/qemu/target/mips/translate.c
index 3b458dbd..20311747 100644
--- a/qemu/target/mips/translate.c
+++ b/qemu/target/mips/translate.c
@@ -38,7 +38,7 @@
 #define MIPS_DEBUG_DISAS 0
 
 /* MIPS major opcodes */
-#define MASK_OP_MAJOR(op)  (op & (0x3F << 26))
+#define MASK_OP_MAJOR(op)  (op & (((uint32_t)0x3F) << 26))
 
 enum {
     /* indirect opcode tables */