diff --git a/src/compiler/glsl_types.cpp b/src/compiler/glsl_types.cpp
index 3929b95f500..e33a5b44f25 100644
--- a/src/compiler/glsl_types.cpp
+++ b/src/compiler/glsl_types.cpp
@@ -2697,7 +2697,7 @@ glsl_type::get_explicit_type_for_size_align(glsl_type_size_align_func type_info,
          malloc(sizeof(struct glsl_struct_field) * this->length);
 
       *size = 0;
-      *alignment = 0;
+      *alignment = 1;
       for (unsigned i = 0; i < this->length; i++) {
          fields[i] = this->fields.structure[i];
          assert(fields[i].matrix_layout != GLSL_MATRIX_LAYOUT_ROW_MAJOR);