diff --git a/src/compiler/nir/nir_opt_large_constants.c b/src/compiler/nir/nir_opt_large_constants.c
index 88e0e0b9485..60f2b5837d6 100644
--- a/src/compiler/nir/nir_opt_large_constants.c
+++ b/src/compiler/nir/nir_opt_large_constants.c
@@ -238,7 +238,7 @@ nir_opt_large_constants(nir_shader *shader,
             continue;
          }
 
-         if (dst_deref && nir_deref_mode_is(dst_deref, nir_var_function_temp)) {
+         if (dst_deref && nir_deref_mode_must_be(dst_deref, nir_var_function_temp)) {
             nir_variable *var = nir_deref_instr_get_variable(dst_deref);
             if (var == NULL)
                continue;
@@ -266,7 +266,7 @@ nir_opt_large_constants(nir_shader *shader,
             }
          }
 
-         if (src_deref && nir_deref_mode_is(src_deref, nir_var_function_temp)) {
+         if (src_deref && nir_deref_mode_must_be(src_deref, nir_var_function_temp)) {
             nir_variable *var = nir_deref_instr_get_variable(src_deref);
             if (var == NULL)
                continue;