diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index d4919970f88..4ac5f4b340f 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -89,6 +89,8 @@ SHLIB_PREREQS = submake-libpgport
 
 SHLIB_EXPORTS = exports.txt
 
+PKG_CONFIG_REQUIRES_PRIVATE = libssl libcrypto
+
 all: all-lib
 
 # Shared library stuff