diff --git a/package/strongswan/strongswan.hash b/package/strongswan/strongswan.hash
index 9a800572d7..abbdbc2bf1 100644
--- a/package/strongswan/strongswan.hash
+++ b/package/strongswan/strongswan.hash
@@ -3,5 +3,6 @@ md5	a6a28eeb22aa58080a7581771a5b63f9	strongswan-5.6.3.tar.bz2
 # Calculated based on the hash above
 sha256	c3c7dc8201f40625bba92ffd32eb602a8909210d8b3fac4d214c737ce079bf24	strongswan-5.6.3.tar.bz2
 # Locally calculated
+sha256	e66c243593ee0713f5fd13bcd7f624bc50eebc54bf87f790ced429ff698077e7  strongswan-5.6.1-5.6.3_gmp-pkcs1-verify.patch
 sha256	8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643  COPYING
 sha256	2292e21797754548dccdef9eef6aee7584e552fbd890fa914e1de8d3577d23f0  LICENSE
diff --git a/package/strongswan/strongswan.mk b/package/strongswan/strongswan.mk
index 5c597d572a..9ef4e183e2 100644
--- a/package/strongswan/strongswan.mk
+++ b/package/strongswan/strongswan.mk
@@ -7,6 +7,8 @@
 STRONGSWAN_VERSION = 5.6.3
 STRONGSWAN_SOURCE = strongswan-$(STRONGSWAN_VERSION).tar.bz2
 STRONGSWAN_SITE = http://download.strongswan.org
+STRONGSWAN_PATCH = \
+	$(STRONGSWAN_SITE)/patches/27_gmp_pkcs1_verify_patch/strongswan-5.6.1-5.6.3_gmp-pkcs1-verify.patch
 STRONGSWAN_LICENSE = GPL-2.0+
 STRONGSWAN_LICENSE_FILES = COPYING LICENSE
 STRONGSWAN_DEPENDENCIES = host-pkgconf