diff --git a/src/plugins/simulator/xplane/xplane.pro b/src/plugins/simulator/xplane/xplane.pro
index 70b0ccfe3..96c09bcb0 100644
--- a/src/plugins/simulator/xplane/xplane.pro
+++ b/src/plugins/simulator/xplane/xplane.pro
@@ -25,7 +25,7 @@ HEADERS += *.h
 DISTFILES += simulatorxplane.json
 DESTDIR = $$DestRoot/bin/plugins/simulator
 
-isEmpty(XSWIFTBUS_COMMIT): error(Missing XSWIFTBUS_COMMIT variable)
+!qtc_run:isEmpty(XSWIFTBUS_COMMIT): error(Missing XSWIFTBUS_COMMIT variable)
 DEFINES += XSWIFTBUS_COMMIT=\\\"$$XSWIFTBUS_COMMIT\\\"
 
 win32 {
diff --git a/src/xswiftbus/xswiftbus.pro b/src/xswiftbus/xswiftbus.pro
index 14e3c3414..fc48abd05 100644
--- a/src/xswiftbus/xswiftbus.pro
+++ b/src/xswiftbus/xswiftbus.pro
@@ -80,7 +80,7 @@ DEFINES += XPMP_CLIENT_LONGNAME=\\\"xswiftbus\\\"
 
 DEFINES += XSWIFTBUS_VERSION=\\\"$$swiftConfig(version.full).$$VER_REV\\\"
 
-isEmpty(XSWIFTBUS_COMMIT): error(Missing XSWIFTBUS_COMMIT variable)
+!qtc_run:isEmpty(XSWIFTBUS_COMMIT): error(Missing XSWIFTBUS_COMMIT variable)
 DEFINES += XSWIFTBUS_COMMIT=\\\"$$XSWIFTBUS_COMMIT\\\"
 
 # X-Plane plugins must follow a prescribed filename and directory structure.