diff --git a/libsrc/atari7800/clock.s b/libsrc/atari7800/clock.s
index 814defceb..3b259cfcf 100644
--- a/libsrc/atari7800/clock.s
+++ b/libsrc/atari7800/clock.s
@@ -2,16 +2,14 @@
 ; 2022-03-15, Karri Kaksonen
 ;
 ; clock_t clock (void);
-; clock_t _clocks_per_sec (void);
 ;
 
-        .export         _clock, __clocks_per_sec, clock_count
+        .export         _clock, clock_count
         .interruptor    update_clock, 2 ; (low priority)
         .constructor    init_clock
 
         .import         sreg: zp
 	.import		_zonecounter
-	.import		_paldetected
         .include        "atari7800.inc"
 
         .macpack        generic
@@ -33,24 +31,6 @@
         rts
         .endproc
 
-;-----------------------------------------------------------------------------
-; Return the number of clock ticks in one second.
-;
-        .proc   __clocks_per_sec
-
-        lda     #0
-	tax
-        sta     sreg            ; return 32 bits
-        sta     sreg+1
-        lda     _paldetected
-	bne	pal
-	lda	#60		; NTSC - 60Hz
-	rts
-pal:
-	lda	#50		; PAL - 50Hz
-        rts
-        .endproc
-
 ;-----------------------------------------------------------------------------
 ; This interrupt handler increments a 24-bit counter at every video
 ; vertical-blanking time.
diff --git a/libsrc/atari7800/clocks_per_sec.s b/libsrc/atari7800/clocks_per_sec.s
new file mode 100644
index 000000000..dc09c4396
--- /dev/null
+++ b/libsrc/atari7800/clocks_per_sec.s
@@ -0,0 +1,34 @@
+;
+; 2022-03-15, Karri Kaksonen
+;
+; clock_t _clocks_per_sec (void);
+;
+
+        .export         __clocks_per_sec
+
+        .import         sreg: zp
+	.import		_paldetected
+        .include        "atari7800.inc"
+
+        .macpack        generic
+
+	.code
+
+;-----------------------------------------------------------------------------
+; Return the number of clock ticks in one second.
+;
+        .proc   __clocks_per_sec
+
+        lda     #0
+	tax
+        sta     sreg            ; return 32 bits
+        sta     sreg+1
+        lda     _paldetected
+	bne	pal
+	lda	#60		; NTSC - 60Hz
+	rts
+pal:
+	lda	#50		; PAL - 50Hz
+        rts
+        .endproc
+