diff --git a/src/dev/audio/speaker.c b/src/dev/audio/speaker.c
index 3461cd8..1477025 100644
--- a/src/dev/audio/speaker.c
+++ b/src/dev/audio/speaker.c
@@ -16,6 +16,7 @@
 
 #include "speaker.h"
 #include "6502.h"
+#include "disk.h" // to be able to disable disk acceleration
 
 
 #define min(x,y) (x) < (y) ? (x) : (y)
@@ -143,6 +144,12 @@ void spkr_toggle() {
     
     spkr_play_time = 0;
     
+    if ( diskAccelerator_count ) {
+        // turn off disk acceleration immediately
+        diskAccelerator_count = 0;
+        clk_6502_per_frm = clk_6502_per_frm_max = clk_6502_per_frm_set;
+    }
+    
     if ( clk_6502_per_frm_set <  clk_6502_per_frm_max_sound ) {
         
         spkr_play_time = spkr_play_timeout;
diff --git a/src/dev/disk/disk.h b/src/dev/disk/disk.h
index 24e9f23..2aa3155 100644
--- a/src/dev/disk/disk.h
+++ b/src/dev/disk/disk.h
@@ -57,6 +57,9 @@ extern const int diskAccelerator_frames;    // number of frames disk acceleratio
 extern int diskAccelerator_count;           // counter for the disk acceleration frames
 extern int diskAccelerator_speed;           // if less than the actual CPU speed, no acceleration
 
+extern int diskAccelerator_count;
+
+
 //extern const unsigned long long clk_6502_per_frm_diskAccelerator;
 //extern const unsigned long long clk_diskAcceleratorTimeout;