diff --git a/Makefile b/Makefile
index 56eddfba..34a4b2f1 100644
--- a/Makefile
+++ b/Makefile
@@ -93,7 +93,8 @@ src/asm/asmy.y: ${yacc_pre}
 mingw:
 	$Qenv PATH=/usr/local/mingw32/bin:/bin:/usr/bin:/usr/local/bin \
 		make CC=gcc CFLAGS="-I/usr/local/mingw32/include \
-			-D__progname=\\\"\\\" ${CFLAGS}"
+			-D__progname=\\\"\\\" \
+			-D_Noreturn='__attribute__((noreturn))' ${CFLAGS}"
 	$Qmv rgbasm rgbasm.exe
 	$Qmv rgblink rgblink.exe
 	$Qmv rgbfix rgbfix.exe
diff --git a/src/extern/err.c b/src/extern/err.c
index 1b5892dd..e277e988 100644
--- a/src/extern/err.c
+++ b/src/extern/err.c
@@ -47,13 +47,13 @@ void rgbds_vwarnx(const char *fmt, va_list ap)
 	putc('\n', stderr);
 }
 
-void rgbds_verr(int status, const char *fmt, va_list ap)
+_Noreturn void rgbds_verr(int status, const char *fmt, va_list ap)
 {
 	vwarn(fmt, ap);
 	exit(status);
 }
 
-void rgbds_verrx(int status, const char *fmt, va_list ap)
+_Noreturn void rgbds_verrx(int status, const char *fmt, va_list ap)
 {
 	vwarnx(fmt, ap);
 	exit(status);
@@ -75,7 +75,7 @@ void rgbds_warnx(const char *fmt, ...)
 	va_end(ap);
 }
 
-void rgbds_err(int status, const char *fmt, ...)
+_Noreturn void rgbds_err(int status, const char *fmt, ...)
 {
 	va_list ap;
 	va_start(ap, fmt);
@@ -83,7 +83,7 @@ void rgbds_err(int status, const char *fmt, ...)
 	va_end(ap);
 }
 
-void rgbds_errx(int status, const char *fmt, ...)
+_Noreturn void rgbds_errx(int status, const char *fmt, ...)
 {
 	va_list ap;
 	va_start(ap, fmt);