diff --git a/share/mk/bsd.sys.mk b/share/mk/bsd.sys.mk
index 169f9fe50779..b4c053d053dc 100644
--- a/share/mk/bsd.sys.mk
+++ b/share/mk/bsd.sys.mk
@@ -127,6 +127,7 @@ CWARNFLAGS+=		-Wno-misleading-indentation
 NO_WBITWISE_INSTEAD_OF_LOGICAL=	-Wno-bitwise-instead-of-logical
 .endif
 .if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 150000
+NO_WSTRICT_PROTOTYPES=	-Wno-strict-prototypes
 NO_WDEPRECATED_NON_PROTOTYPE=-Wno-deprecated-non-prototype
 .endif
 .if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} >= 100100