diff --git a/openldap/ExternalProject_openldap.mk b/openldap/ExternalProject_openldap.mk
index 88d49dcfaa29..396841fab446 100644
--- a/openldap/ExternalProject_openldap.mk
+++ b/openldap/ExternalProject_openldap.mk
@@ -36,7 +36,7 @@ $(call gb_ExternalProject_get_state_target,openldap,build) :
 				, \
 				CPPFLAGS="-I$(call gb_UnpackedTarball_get_dir,nss)/mozilla/dist/public/nss -I$(call gb_UnpackedTarball_get_dir,nss)/mozilla/dist/out/include" \
 				CFLAGS="-I$(call gb_UnpackedTarball_get_dir,nss)/mozilla/dist/public/nss -I$(call gb_UnpackedTarball_get_dir,nss)/mozilla/dist/out/include" \
-				LDFLAGS="-L$(OUTDIR)/lib" \
+				LDFLAGS="-L$(OUTDIR)/lib $(if $(filter AIX,$(OS)),-Wl$(COMMA)-brtl)" \
 			) \
 		&& MAKEFLAGS= && $(MAKE) \
 	)