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-rw-r--r--newgrf_spritegroup.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/newgrf_spritegroup.c b/newgrf_spritegroup.c
index cac7bbb20..d389c07ad 100644
--- a/newgrf_spritegroup.c
+++ b/newgrf_spritegroup.c
@@ -112,7 +112,7 @@ static inline uint32 GetVariable(const ResolverObject *object, byte variable, by
/* Evaluate an adjustment for a variable of the given size. This is a bit of
* an unwieldy macro, but it saves triplicating the code. */
#define BUILD_EVAL_ADJUST(size, usize) \
-static inline size EvalAdjust_ ## size(const DeterministicSpriteGroupAdjust *adjust, size last_value, size value) \
+static inline size EvalAdjust_ ## size(const DeterministicSpriteGroupAdjust *adjust, size last_value, uint value) \
{ \
value >>= adjust->shift_num; \
value &= adjust->and_mask; \
@@ -125,6 +125,9 @@ static inline size EvalAdjust_ ## size(const DeterministicSpriteGroupAdjust *adj
case DSGA_TYPE_NONE: break; \
} \
\
+ /* Get our value to the correct range */ \
+ value = (size)value; \
+\
switch (adjust->operation) { \
case DSGA_OP_ADD: return last_value + value; \
case DSGA_OP_SUB: return last_value - value; \