diff --git a/libsrc/geos/system/get_ostype.s b/libsrc/geos/system/get_ostype.s
index 946df89eb..a68bdfe0b 100644
--- a/libsrc/geos/system/get_ostype.s
+++ b/libsrc/geos/system/get_ostype.s
@@ -28,7 +28,7 @@ geos10:
 	    rts
 
 _get_tv:
-	    jsr get_ostype
+	    jsr _get_ostype
 	    bpl only40			; C64 with 40 columns only
 	    lda graphMode
 	    bpl only40			; C128 but currently on 40 columns