diff --git a/cmake/externals/qxmpp/CMakeLists.txt b/cmake/externals/qxmpp/CMakeLists.txt
index e605e2b253..d5ccd0c020 100644
--- a/cmake/externals/qxmpp/CMakeLists.txt
+++ b/cmake/externals/qxmpp/CMakeLists.txt
@@ -25,7 +25,7 @@ ExternalProject_Add(
   BUILD_IN_SOURCE 1
   PATCH_COMMAND patch -p2 -t -N --verbose < ${CMAKE_CURRENT_SOURCE_DIR}/qxmpp.patch
   CONFIGURE_COMMAND ${QMAKE_COMMAND} PREFIX=<INSTALL_DIR>
-  BUILD_COMMAND PLATFORM_BUILD_COMMAND
+  BUILD_COMMAND ${PLATFORM_BUILD_COMMAND}
   LOG_DOWNLOAD 1
   LOG_CONFIGURE 1
   LOG_BUILD 1