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-rw-r--r--src/multibyte/internal.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/multibyte/internal.h b/src/multibyte/internal.h
index 53d62eda..51308f4f 100644
--- a/src/multibyte/internal.h
+++ b/src/multibyte/internal.h
@@ -18,7 +18,7 @@ extern const uint32_t bittab[];
 #define OOB(c,b) (((((b)>>3)-0x10)|(((b)>>3)+((int32_t)(c)>>26))) & ~7)
 
 /* Interval [a,b). Either a must be 80 or b must be c0, lower 3 bits clear. */
-#define R(a,b) ((uint32_t)((a==0x80 ? 0x40-b : -a) << 23))
+#define R(a,b) ((uint32_t)((a==0x80 ? 0x40u-b : 0u-a) << 23))
 #define FAILSTATE R(0x80,0x80)
 
 #define SA 0xc2u