diff --git a/res/Makefile b/res/Makefile
index deab737232..b0967f8280 100755
--- a/res/Makefile
+++ b/res/Makefile
@@ -17,6 +17,10 @@ CRYPTO_LIBS=-lssl -lcrypto
 
 CFLAGS+=
 CFLAGS+=$(shell [ -f /usr/include/linux/zaptel.h ] && echo " -DZAPATA_MOH")
+#
+# Work around buggy RedHat 9.0
+#
+CFLAGS+=-DOPENSSL_NO_KRB5
 
 all: $(MODS)