diff --git a/src/include/86box/pit.h b/src/include/86box/pit.h
index eb03fd2c9..3c5a9cb52 100644
--- a/src/include/86box/pit.h
+++ b/src/include/86box/pit.h
@@ -19,6 +19,8 @@
 #ifndef EMU_PIT_H
 #define EMU_PIT_H
 
+#define NUM_COUNTERS 3
+
 typedef struct ctr_t {
     uint8_t m;
     uint8_t ctrl;
@@ -68,7 +70,7 @@ typedef struct PIT {
     int        clock;
     pc_timer_t callback_timer;
 
-    ctr_t counters[3];
+    ctr_t counters[NUM_COUNTERS];
 
     uint8_t ctrl;
 
diff --git a/src/include/86box/pit_fast.h b/src/include/86box/pit_fast.h
index 5650ffb4d..f824bad68 100644
--- a/src/include/86box/pit_fast.h
+++ b/src/include/86box/pit_fast.h
@@ -68,7 +68,7 @@ typedef struct ctrf_t {
 
 typedef struct pitf_t {
     int    flags;
-    ctrf_t counters[3];
+    ctrf_t counters[NUM_COUNTERS];
 
     uint8_t ctrl;
 
diff --git a/src/pit.c b/src/pit.c
index 0816094cb..8b9f23a79 100644
--- a/src/pit.c
+++ b/src/pit.c
@@ -526,7 +526,7 @@ pit_timer_over(void *priv)
 
     dev->clock ^= 1;
 
-    for (uint8_t i = 0; i < 3; i++)
+    for (uint8_t i = 0; i < NUM_COUNTERS; i++)
         pit_ctr_set_clock_common(&dev->counters[i], dev->clock, dev);
 
     timer_advance_u64(&dev->callback_timer, dev->pit_const >> 1ULL);
@@ -874,7 +874,7 @@ pit_device_reset(pit_t *dev)
 {
     dev->clock = 0;
 
-    for (uint8_t i = 0; i < 3; i++)
+    for (uint8_t i = 0; i < NUM_COUNTERS; i++)
         ctr_reset(&dev->counters[i]);
 }
 
@@ -885,7 +885,7 @@ pit_reset(pit_t *dev)
 
     dev->clock = 0;
 
-    for (uint8_t i = 0; i < 3; i++)
+    for (uint8_t i = 0; i < NUM_COUNTERS; i++)
         ctr_reset(&dev->counters[i]);
 
     /* Disable speaker gate. */
diff --git a/src/pit_fast.c b/src/pit_fast.c
index e986600ee..0f82d894d 100644
--- a/src/pit_fast.c
+++ b/src/pit_fast.c
@@ -670,7 +670,7 @@ pitf_reset(pitf_t *dev)
 {
     memset(dev, 0, sizeof(pitf_t));
 
-    for (uint8_t i = 0; i < 3; i++)
+    for (uint8_t i = 0; i < NUM_COUNTERS; i++)
         ctr_reset(&dev->counters[i]);
 
     /* Disable speaker gate. */
@@ -683,7 +683,7 @@ pitf_set_pit_const(void *data, uint64_t pit_const)
     pitf_t *pit = (pitf_t *) data;
     ctrf_t *ctr;
 
-    for (uint8_t i = 0; i < 3; i++) {
+    for (uint8_t i = 0; i < NUM_COUNTERS; i++) {
         ctr = &pit->counters[i];
         ctr->pit_const = pit_const;
     }
@@ -728,7 +728,7 @@ pitf_init(const device_t *info)
     dev->flags = info->local;
 
     if (!(dev->flags & PIT_PS2) && !(dev->flags & PIT_CUSTOM_CLOCK)) {
-        for (int i = 0; i < 3; i++) {
+        for (int i = 0; i < NUM_COUNTERS; i++) {
             ctrf_t *ctr = &dev->counters[i];
             ctr->priv = dev;
             timer_add(&ctr->timer, pitf_timer_over, (void *) ctr, 0);