diff --git a/scan/scan_httpdate.c b/scan/scan_httpdate.c
index ec8773f..a8fcfc2 100644
--- a/scan/scan_httpdate.c
+++ b/scan/scan_httpdate.c
@@ -1,5 +1,7 @@
 #define _GNU_SOURCE
+#ifdef __dietlibc__
 #define __deprecated__
+#endif
 #include "scan.h"
 #include "byte.h"
 #include "case.h"
diff --git a/scan/scan_iso8601.c b/scan/scan_iso8601.c
index 1033f7d..ce0bafc 100644
--- a/scan/scan_iso8601.c
+++ b/scan/scan_iso8601.c
@@ -1,5 +1,7 @@
 #define _GNU_SOURCE
+#ifdef __dietlibc__
 #define __deprecated__
+#endif
 #include "scan.h"
 #include "byte.h"
 #include "case.h"