diff --git a/configure.ac b/configure.ac
index 0104554dc..99c662792 100644
--- a/configure.ac
+++ b/configure.ac
@@ -761,6 +761,8 @@ AC_ARG_WITH([nss], AC_HELP_STRING([--with-nss=path],
 	fi
         LIBS="$LIBS -lnss3 -lnspr4"
 	SSLLIB=""
+	PC_CRYPTO_DEPENDENCY="nss nspr"
+	AC_SUBST(PC_CRYPTO_DEPENDENCY)
 	]
 )
 
@@ -781,6 +783,8 @@ AC_ARG_WITH([nettle], AC_HELP_STRING([--with-nettle=path],
 	fi
         LIBS="$LIBS -lhogweed -lnettle -lgmp"
 	SSLLIB=""
+	PC_CRYPTO_DEPENDENCY="hogweed nettle"
+	AC_SUBST(PC_CRYPTO_DEPENDENCY)
 	]
 )
 
@@ -790,6 +794,9 @@ ACX_WITH_SSL
 ACX_LIB_SSL
 SSLLIB="-lssl"
 
+PC_CRYPTO_DEPENDENCY="libcrypto libssl"
+AC_SUBST(PC_CRYPTO_DEPENDENCY)
+
 # check if -lcrypt32 is needed because CAPIENG needs that. (on windows)
 BAKLIBS="$LIBS"
 LIBS="-lssl $LIBS"
diff --git a/contrib/libunbound.pc.in b/contrib/libunbound.pc.in
index 74dfdb6fc..f7cd1e074 100644
--- a/contrib/libunbound.pc.in
+++ b/contrib/libunbound.pc.in
@@ -7,7 +7,7 @@ Name: unbound
 Description: Library with validating, recursive, and caching DNS resolver
 URL: http://www.unbound.net
 Version: @PACKAGE_VERSION@
-Requires: libcrypto libssl @PC_LIBEVENT_DEPENDENCY@
+Requires: @PC_CRYPTO_DEPENDENCY@ @PC_LIBEVENT_DEPENDENCY@
 Requires.private: @PC_PY_DEPENDENCY@
 Libs: -L${libdir} -lunbound
 Libs.private: @SSLLIB@ @LIBS@