diff --git a/src/mumble/CMakeLists.txt b/src/mumble/CMakeLists.txt
index 1f0059afd..31f6e3d29 100644
--- a/src/mumble/CMakeLists.txt
+++ b/src/mumble/CMakeLists.txt
@@ -246,6 +246,8 @@ set(MUMBLE_SOURCES
 if(static AND WIN32)
 	# On Windows, building a static client means building the main app into a DLL.
 	add_library(mumble SHARED ${MUMBLE_SOURCES})
+	add_compile_definitions(mumble PRIVATE "MUMBLEAPP_DLL")
+
 	set_target_properties(mumble PROPERTIES OUTPUT_NAME "mumble_app")
 	if(MINGW)
 		# Remove "lib" prefix.
diff --git a/src/mumble/main.cpp b/src/mumble/main.cpp
index f223106bc..a757e03d8 100644
--- a/src/mumble/main.cpp
+++ b/src/mumble/main.cpp
@@ -76,7 +76,7 @@ extern int os_early_init();
 extern HWND mumble_mw_hwnd;
 #endif // Q_OS_WIN
 
-#if defined(Q_OS_WIN) && !defined(QT_NO_DEBUG)
+#if defined(Q_OS_WIN) && !defined(MUMBLEAPP_DLL)
 extern "C" __declspec(dllexport) int main(int argc, char **argv) {
 #else
 int main(int argc, char **argv) {
@@ -759,7 +759,7 @@ int main(int argc, char **argv) {
 	return res;
 }
 
-#if defined(Q_OS_WIN) && defined(QT_NO_DEBUG)
+#if defined(Q_OS_WIN) && defined(MUMBLEAPP_DLL)
 extern "C" __declspec(dllexport) int MumbleMain(HINSTANCE instance, HINSTANCE prevInstance, LPSTR cmdArg, int cmdShow) {
 	Q_UNUSED(instance)
 	Q_UNUSED(prevInstance)