diff --git a/net/hping/Makefile b/net/hping/Makefile
index 3f3c2458536a7..30770a14a5d07 100644
--- a/net/hping/Makefile
+++ b/net/hping/Makefile
@@ -21,6 +21,8 @@ INSTALLATION_DIRS=	${PKGMANDIR}/man8 sbin
 CONFIGURE_ENV+=		PCAPINCDIR=${BUILDLINK_PREFIX.libpcap}/include
 CONFIGURE_ENV+=		PCAPLIBDIR=${BUILDLINK_PREFIX.libpcap}/lib
 
+CFLAGS.SunOS+= -Du_int8_t=uint8_t -Du_int16_t=uint16_t -Du_int32_t=uint32_t
+
 .include "options.mk"
 
 do-install: