diff --git a/src/bin/diffutils/config.h b/src/bin/diffutils/config.h
index c8bcf8b7fd..626830e05e 100644
--- a/src/bin/diffutils/config.h
+++ b/src/bin/diffutils/config.h
@@ -1257,7 +1257,7 @@
 #define STDC_HEADERS 1
 
 /* Define to 1 if strerror_r returns char *. */
-#define STRERROR_R_CHAR_P 1
+/* #undef STRERROR_R_CHAR_P */
 
 /* Define to be the nanoseconds member of struct stat's st_mtim, if it exists.
    */