diff --git a/libsrc/common/fmisc.s b/libsrc/common/fmisc.s
index 185a4ec9c..a8c913b5e 100644
--- a/libsrc/common/fmisc.s
+++ b/libsrc/common/fmisc.s
@@ -1,4 +1,4 @@
-;
+;                                   
 ; Ullrich von Bassewitz, 31.05.1998
 ;
 ; Several small file stream functions
@@ -9,17 +9,19 @@
 	.import	 	__errno
 	.importzp 	ptr1
 
+        .include        "_file.inc"
+
 ;
 ; Get the FILE* parameter, check if the file is open
 ;
 
 getf:	sta	ptr1
 	stx	ptr1+1
-	ldy	#1
-	lda	(ptr1),y	; get f->f_flags
-	and	#$01 		; file open?
-	beq    	@L1		; jump if no
-	clc	     		; ok
+	ldy	#_FILE_f_flags
+	lda	(ptr1),y      	; get f->f_flags
+	and	#_FOPEN         ; file open?
+	beq    	@L1   		; jump if no
+	clc	      		; ok
 	rts
 @L1:	sec
 	rts
@@ -32,7 +34,7 @@ _clearerr:
        	jsr	getf
        	bcs	err
        	lda	(ptr1),y
-       	and	#$F9
+       	and	#<~(_FEOF | _FERROR)
        	sta	(ptr1),y
 err:	rts
 
@@ -44,7 +46,7 @@ _feof:
  	jsr	getf
 ;	bcs	err
  	lda	(ptr1),y
- 	and	#$02
+ 	and	#_FEOF
  	ldx	#0
  	rts
 
@@ -56,7 +58,7 @@ _ferror:
  	jsr	getf
 ;	bcs	err
  	lda	(ptr1),y
- 	and	#$04
+ 	and	#_FERROR
  	ldx	#0
  	rts