diff --git a/debian/rules b/debian/rules
index f451768d..33d044e3 100755
--- a/debian/rules
+++ b/debian/rules
@@ -207,7 +207,7 @@ override_dh_auto_configure: preconfigure
 	fi; \
 	echo "Using cmake: $$CMAKE_BIN"; \
 	cd $(TARGET_BUILD) && \
-	$$CMAKE_BIN ../ \
+	$(PRE_PROCESS_CONF) $$CMAKE_BIN ../ \
 	-DCMAKE_INSTALL_PREFIX=/usr/lib/llvm-$(LLVM_VERSION) \
 	-DCMAKE_VERBOSE_MAKEFILE=ON \
 	-DCMAKE_BUILD_TYPE=RelWithDebInfo \