diff --git a/src/libcore/mmap.cpp b/src/libcore/mmap.cpp
index c00586c4..77a3bf54 100644
--- a/src/libcore/mmap.cpp
+++ b/src/libcore/mmap.cpp
@@ -38,7 +38,7 @@ struct MemoryMappedFile::MemoryMappedFilePrivate {
 				Log(EError, "Could not map \"%s\" to memory!", filename.string().c_str());
 			if (close(fd) != 0)
 				Log(EError, "close(): unable to close file!");
-		#elif defined(___WINDOWS__)
+		#elif defined(__WINDOWS__)
 			file = CreateFile(filename.string().c_str(), GENERIC_WRITE | GENERIC_READ,
 				FILE_SHARE_READ, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
 			if (file == INVALID_HANDLE_VALUE)
diff --git a/src/libcore/plugin.cpp b/src/libcore/plugin.cpp
index 25116f25..27290040 100644
--- a/src/libcore/plugin.cpp
+++ b/src/libcore/plugin.cpp
@@ -61,7 +61,7 @@ struct Plugin::PluginPrivate {
 
 Plugin::Plugin(const std::string &shortName, const fs::path &path)
  : d(new PluginPrivate(shortName, path)) {
-#if defined(___WINDOWS__)
+#if defined(__WINDOWS__)
 	d->handle = LoadLibraryW(path.c_str());
 	if (!d->handle) {
 		SLog(EError, "Error while loading plugin \"%s\": %s",
@@ -77,7 +77,7 @@ Plugin::Plugin(const std::string &shortName, const fs::path &path)
 	try {
 		d->getDescription = (GetDescriptionFunc) getSymbol("GetDescription");
 	} catch (...) {
-#if defined(___WINDOWS__)
+#if defined(__WINDOWS__)
 		FreeLibrary(d->handle);
 #else
 		dlclose(d->handle);
@@ -102,7 +102,7 @@ Plugin::Plugin(const std::string &shortName, const fs::path &path)
 }
 
 bool Plugin::hasSymbol(const std::string &sym) const {
-#if defined(___WINDOWS__)
+#if defined(__WINDOWS__)
 	void *ptr = GetProcAddress(d->handle, sym.c_str());
 #else
 	void *ptr = dlsym(d->handle, sym.c_str());
@@ -111,7 +111,7 @@ bool Plugin::hasSymbol(const std::string &sym) const {
 }
 
 void *Plugin::getSymbol(const std::string &sym) {
-#if defined(___WINDOWS__)
+#if defined(__WINDOWS__)
 	void *data = GetProcAddress(d->handle, sym.c_str());
 	if (!data) {
 		SLog(EError, "Could not resolve symbol \"%s\" in \"%s\": %s",
@@ -152,7 +152,7 @@ const std::string& Plugin::getShortName() const {
 }
 
 Plugin::~Plugin() {
-#if defined(___WINDOWS__)
+#if defined(__WINDOWS__)
 	FreeLibrary(d->handle);
 #else
 	dlclose(d->handle);
diff --git a/src/libcore/random.cpp b/src/libcore/random.cpp
index 9f1d8a0f..aea66a53 100644
--- a/src/libcore/random.cpp
+++ b/src/libcore/random.cpp
@@ -473,7 +473,7 @@ void Random::State::init_by_array(const uint32_t *init_key, int key_length) {
 Random::Random() : mt(NULL) {
 	mt = (State *) allocAligned(sizeof(State));
 	Assert(mt != NULL);
-#if defined(___WINDOWS__)
+#if defined(__WINDOWS__)
 	seed();
 #else
 #if 0