diff --git a/src/structs.h b/src/structs.h
index f7ae16b..0fb57f4 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -2077,10 +2077,10 @@
 # endif
 #else
 // dummy typedefs for use in function prototypes
-typedef struct
+struct ufunc_S
 {
     int	    dummy;
-} ufunc_T;
+};
 typedef struct
 {
     int	    dummy;