diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 0c4e55b6ad3..43682574b23 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -94,7 +94,9 @@ SHLIB_PREREQS = submake-libpgport
 
 SHLIB_EXPORTS = exports.txt
 
+ifeq ($(with_ssl),openssl)
 PKG_CONFIG_REQUIRES_PRIVATE = libssl libcrypto
+endif
 
 all: all-lib