diff --git a/include/bfd.h b/include/bfd.h
index 97c189566c..b76c5df761 100644
--- a/include/bfd.h
+++ b/include/bfd.h
@@ -61,7 +61,9 @@ typedef struct _bfd bfd;
    and false on failure (unless they're a predicate).   -- bfd.doc */
 /* I'm sure this is going to break something and someone is going to
    force me to change it. */
-typedef enum boolean {false, true} boolean;
+/* typedef enum boolean {false, true} boolean; */
+/* Yup, SVR4 has a "typedef enum boolean" in <sys/types.h>  -fnf */
+typedef enum bfd_boolean {false, true} boolean;
 
 /* Try to avoid breaking stuff */
 typedef  long int file_ptr;