diff --git a/tmk_core/protocol/ibmpc.cpp b/tmk_core/protocol/ibmpc.cpp
index 95f69e17..744b6621 100644
--- a/tmk_core/protocol/ibmpc.cpp
+++ b/tmk_core/protocol/ibmpc.cpp
@@ -217,7 +217,7 @@ inline void IBMPC::isr(void)
         timer_start = t;
     } else {
         // This gives 2.0ms at least before timeout
-        if ((uint8_t)(t - timer_start) >= 3) {
+        if ((uint8_t)(t - timer_start) >= 5) {
             isr_debug = isr_state;
             error = IBMPC_ERR_TIMEOUT;
             goto ERROR;