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-rw-r--r--tmk_core/common/sync_timer.c2
-rw-r--r--tmk_core/common/sync_timer.h2
2 files changed, 2 insertions, 2 deletions
diff --git a/tmk_core/common/sync_timer.c b/tmk_core/common/sync_timer.c
index de24b463b6..68b92d8b43 100644
--- a/tmk_core/common/sync_timer.c
+++ b/tmk_core/common/sync_timer.c
@@ -26,7 +26,7 @@ SOFTWARE.
#include "sync_timer.h"
#include "keyboard.h"
-#if defined(SPLIT_KEYBOARD) && !defined(DISABLE_SYNC_TIMER)
+#if (defined(SPLIT_KEYBOARD) || defined(SERIAL_LINK_ENABLE)) && !defined(DISABLE_SYNC_TIMER)
volatile int32_t sync_timer_ms;
void sync_timer_init(void) { sync_timer_ms = 0; }
diff --git a/tmk_core/common/sync_timer.h b/tmk_core/common/sync_timer.h
index 9ddef45bb2..744e2b50d5 100644
--- a/tmk_core/common/sync_timer.h
+++ b/tmk_core/common/sync_timer.h
@@ -32,7 +32,7 @@ SOFTWARE.
extern "C" {
#endif
-#if defined(SPLIT_KEYBOARD) && !defined(DISABLE_SYNC_TIMER)
+#if (defined(SPLIT_KEYBOARD) || defined(SERIAL_LINK_ENABLE)) && !defined(DISABLE_SYNC_TIMER)
void sync_timer_init(void);
void sync_timer_update(uint32_t time);
uint16_t sync_timer_read(void);