diff --git a/clay.h b/clay.h
index 3d53a9f..88f979f 100644
--- a/clay.h
+++ b/clay.h
@@ -3819,7 +3819,7 @@ Clay__Warning *Clay__WarningArray_Add(Clay__WarningArray *array, Clay__Warning i
 void* Clay__Array_Allocate_Arena(int32_t capacity, uint32_t itemSize, Clay_Arena *arena)
 {
     size_t totalSizeBytes = capacity * itemSize;
-    uintptr_t nextAllocOffset = arena->nextAllocation + (64 - (arena->nextAllocation % 64));
+    uintptr_t nextAllocOffset = arena->nextAllocation + ((64 - (arena->nextAllocation % 64)) & 63);
     if (nextAllocOffset + totalSizeBytes <= arena->capacity) {
         arena->nextAllocation = nextAllocOffset + totalSizeBytes;
         return (void*)((uintptr_t)arena->memory + (uintptr_t)nextAllocOffset);