diff --git a/tests/libtest/lib1960.c b/tests/libtest/lib1960.c
index 2ce9a7540d..ae1f989840 100644
--- a/tests/libtest/lib1960.c
+++ b/tests/libtest/lib1960.c
@@ -63,7 +63,7 @@ static int sockopt_cb(void *clientp,
 }
 
 #ifdef __AMIGA__
-#define my_inet_pton(x, y, z) inet_pton(x, (unsigned char *)y, z)
+#define my_inet_pton(x, y, z) inet_pton(x, (unsigned char *)CURL_UNCONST(y), z)
 #else
 #define my_inet_pton(x, y, z) inet_pton(x, y, z)
 #endif