diff --git a/src/Makefile b/src/Makefile
index a5de157..d08de80 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -185,4 +185,4 @@
 .SUFFIXES: .o .c
 
 .c$(OBJ_EXT):
-	$(CC) -Iltm -Iltc/headers -DLTC_SOURCE -DLTC_NO_TEST -DLTC_NO_PROTOTYPES -DLTM_DESC $(CFLAGS) -c $< -o $@
+	$(CC) -Iltm -Iltc/headers -DLTC_SOURCE -DLTC_NO_TEST -DLTC_NO_PROTOTYPES -DLTM_DESC $(CFLAGS) -DARGTYPE=4 -c $< -o $@
diff --git a/src/Makefile.nmake b/src/Makefile.nmake
index 1d9ad6c..c78076a 100644
--- a/src/Makefile.nmake
+++ b/src/Makefile.nmake
@@ -186,5 +186,5 @@
 	$(RM_F) $(OBJS) liballinone.lib
 
 .c.obj:
-        cl /Iltm /Iltc/headers /DLTC_SOURCE /DLTC_NO_TEST /DLTC_NO_PROTOTYPES /DLTM_DESC $(CFLAGS) /c $< /Fo$@
+        cl /Iltm /Iltc/headers /DLTC_SOURCE /DLTC_NO_TEST /DLTC_NO_PROTOTYPES /DLTM_DESC /DARGTYPE=4 $(CFLAGS) /c $< /Fo$@