diff --git a/security/sks/Makefile b/security/sks/Makefile
index 93a60784edcb2..823a8822b3e4c 100644
--- a/security/sks/Makefile
+++ b/security/sks/Makefile
@@ -33,6 +33,8 @@ post-extract:
 
 post-patch:
 	@${REINPLACE_CMD} -e '/^CC=/d; /^CFLAGS=/s/=/+=/' ${WRKSRC}/bdb/Makefile
+	@${REINPLACE_CMD} -E '/^\+OCAML(C|OPT)=/s,$$, -unsafe-string,' \
+		${WRKSRC}/cryptokit-1.7-sks.patch
 
 pre-build:
 	@cd ${WRKSRC} && test -f .depend || ${MAKE_CMD} dep
diff --git a/security/sks/files/patch-Makefile b/security/sks/files/patch-Makefile
index 86d7c495fa7ae..f7071a5b7447d 100644
--- a/security/sks/files/patch-Makefile
+++ b/security/sks/files/patch-Makefile
@@ -1,6 +1,6 @@
---- Makefile.orig	2019-06-06 15:28:32 UTC
+--- Makefile.orig	2021-09-05 17:11:36 UTC
 +++ Makefile
-@@ -15,9 +15,8 @@
+@@ -15,16 +15,15 @@
  #   USA
  #
  CINCLUDES=-I`ocamlc -where`
@@ -11,6 +11,14 @@
  CXXFLAGS=-O3 $(CINCLUDES) -I .
  
  ifndef OCAMLC
+ 	OCAMLC=ocamlc
+ endif
+ ifndef OCAMLOPT
+-	OCAMLOPT=ocamlopt
++	OCAMLOPT=ocamlopt -unsafe-string
+ endif
+ ifndef CAMLP4O
+ 	CAMLP4O=camlp4o
 @@ -135,16 +134,16 @@ keyMerge.cmx: keyMerge.ml
  # Special targets