diff --git a/src/compiler/glsl/shader_cache.cpp b/src/compiler/glsl/shader_cache.cpp
index 3af14be..a6e9982 100644
--- a/src/compiler/glsl/shader_cache.cpp
+++ b/src/compiler/glsl/shader_cache.cpp
@@ -76,10 +76,9 @@
 
 static void
 get_struct_type_field_and_pointer_sizes(size_t *s_field_size,
-                                        size_t *s_field_ptrs,
-                                        unsigned num_fields)
+                                        size_t *s_field_ptrs)
 {
-   *s_field_size = sizeof(glsl_struct_field) * num_fields;
+   *s_field_size = sizeof(glsl_struct_field);
    *s_field_ptrs =
      sizeof(((glsl_struct_field *)0)->type) +
      sizeof(((glsl_struct_field *)0)->name);
@@ -140,8 +139,7 @@
       blob_write_uint32(blob, type->length);
 
       size_t s_field_size, s_field_ptrs;
-      get_struct_type_field_and_pointer_sizes(&s_field_size, &s_field_ptrs,
-                                              type->length);
+      get_struct_type_field_and_pointer_sizes(&s_field_size, &s_field_ptrs);
 
       for (unsigned i = 0; i < type->length; i++) {
          encode_type_to_blob(blob, type->fields.structure[i].type);
@@ -213,8 +211,7 @@
       unsigned num_fields = blob_read_uint32(blob);
 
       size_t s_field_size, s_field_ptrs;
-      get_struct_type_field_and_pointer_sizes(&s_field_size, &s_field_ptrs,
-                                              num_fields);
+      get_struct_type_field_and_pointer_sizes(&s_field_size, &s_field_ptrs);
 
       glsl_struct_field *fields =
          (glsl_struct_field *) malloc(s_field_size * num_fields);