diff --git a/lib/setup.h b/lib/setup.h
index 2243bc98642362efe38d9a375191b996341d7918..9361991381e51a853fc84481b42ee0c80b61cc52 100644
--- a/lib/setup.h
+++ b/lib/setup.h
@@ -305,7 +305,7 @@ typedef struct in_addr Curl_ipconnect;
 /* This could benefit from additional checks that some of the used/important
    header files are present as well before we define the USE_* define. */
 #define USE_LIBIDN
-#define LIBIDN_REQUIRED_VERSION "0.4.5"
+#define LIBIDN_REQUIRED_VERSION "0.4.1"
 #endif
 
 #endif /* __CONFIG_H */