diff --git a/src/compiler/nir/nir_opt_large_constants.c b/src/compiler/nir/nir_opt_large_constants.c
index fec6cceb325..b1d90be8336 100644
--- a/src/compiler/nir/nir_opt_large_constants.c
+++ b/src/compiler/nir/nir_opt_large_constants.c
@@ -118,8 +118,11 @@ handle_constant_store(void *mem_ctx, struct var_info *info,
       info->constant_data = rzalloc_size(mem_ctx, var_size);
    }
 
-   char *dst = (char *)info->constant_data +
-               nir_deref_instr_get_const_offset(deref, size_align);
+   const unsigned offset = nir_deref_instr_get_const_offset(deref, size_align);
+   if (offset >= info->constant_data_size)
+      return;
+
+   char *dst = (char *)info->constant_data + offset;
 
    for (unsigned i = 0; i < num_components; i++) {
       if (!(writemask & (1 << i)))