diff --git a/src/commands.c b/src/commands.c
index 4e7d66c..53efc69 100644
--- a/src/commands.c
+++ b/src/commands.c
@@ -67,7 +67,7 @@ static int read_key(void)
 	char key;
 	int ret = 0;
 
-#if defined HAVE_TERMIOS_H && !defined WIN32
+#if defined(HAVE_TERMIOS_H) && !defined(_WIN32)
 #ifdef __CYGWIN__
 	if (stdin_ready_for_reading())
 #endif
diff --git a/src/main.c b/src/main.c
index 6320699..8376e73 100644
--- a/src/main.c
+++ b/src/main.c
@@ -245,7 +245,7 @@ int main(int argc, char **argv)
 	int val, lf_flag;
 	int flags;
 	int played;
-#ifndef WIN32
+#ifndef _WIN32
 	struct timeval tv;
 	struct timezone tz;
 
diff --git a/src/read_config.c b/src/read_config.c
index 1c0d2ee..6e38c76 100644
--- a/src/read_config.c
+++ b/src/read_config.c
@@ -59,7 +59,7 @@ int read_config(struct options *o)
 
 	if ((rc = fopen(myrc, "r")) == NULL)
 		return -1;
-#elif defined WIN32
+#elif defined _WIN32
 	const char *home = getenv("USERPROFILE");
 	if (!home) home = "C:";
 
@@ -291,7 +291,7 @@ void read_modconf(struct options *o, unsigned char *md5)
 	parse_modconf(o, myrc, md5);
 #elif defined __AMIGA__
 	parse_modconf(o, "PROGDIR:modules.conf", md5);
-#elif defined WIN32
+#elif defined _WIN32
 	char myrc[PATH_MAX];
 	const char *home = getenv("USERPROFILE");
 	if (!home) home = "C:";
diff --git a/src/win32/usleep.c b/src/win32/usleep.c
index 0f81774..3c24a9d 100644
--- a/src/win32/usleep.c
+++ b/src/win32/usleep.c
@@ -19,7 +19,7 @@ void usleep(long usec)
         select(0, NULL, NULL, NULL, &tv);
 }
 
-#elif defined WIN32
+#elif defined(_WIN32)
 
 /* usleep implementation from FreeSCI */