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-rw-r--r--src/mesa/main/mtypes.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 801bd17666f..b7a7b34a090 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -59,7 +59,7 @@ extern "C" {
#define BITFIELD_BIT(b) ((GLbitfield)1 << (b))
/** Set all bits up to excluding bit b */
#define BITFIELD_MASK(b) \
- ((b) == 32 ? (~(GLbitfield)0) : BITFIELD_BIT(b) - 1)
+ ((b) == 32 ? (~(GLbitfield)0) : BITFIELD_BIT((b) % 32) - 1)
/** Set count bits starting from bit b */
#define BITFIELD_RANGE(b, count) \
(BITFIELD_MASK((b) + (count)) & ~BITFIELD_MASK(b))