diff --git a/src/freedreno/isa/encode.py b/src/freedreno/isa/encode.py
index 576fef626ac..699d5c9b660 100644
--- a/src/freedreno/isa/encode.py
+++ b/src/freedreno/isa/encode.py
@@ -345,7 +345,7 @@ struct bitset_params;
 static uint64_t
 pack_field(unsigned low, unsigned high, uint64_t val)
 {
-   val &= ((1ul << (1 + high - low)) - 1);
+   val &= ((UINT64_C(1) << (1 + high - low)) - 1);
    return val << low;
 }