diff --git a/structs.asm b/structs.asm
index b5b8029..4f626d1 100644
--- a/structs.asm
+++ b/structs.asm
@@ -331,7 +331,7 @@ FIELD_NAME::
                 ds STRUCT_FIELD_SIZE
             ELSE
 
-DATA_TYPE equs STRCAT("D", {{STRUCT_FIELD_TYPE}})
+DATA_TYPE equs STRCAT("D", "{{STRUCT_FIELD_TYPE}}")
 
                 REPT STRUCT_FIELD_NBEL
                     DATA_TYPE \3