diff --git a/sysutils/f3/Makefile b/sysutils/f3/Makefile
index 9d01d36bc0f..3f2e376e48b 100644
--- a/sysutils/f3/Makefile
+++ b/sysutils/f3/Makefile
@@ -9,6 +9,10 @@ CATEGORIES=	sysutils
 # GPLv3
 PERMIT_PACKAGE=	Yes
 
+# C17
+COMPILER=	base-clang ports-gcc
+COMPILER_LANGS=	c
+
 # uses pledge()
 WANTLIB=	c m