diff --git a/libraries/Arduino_LED_Matrix/src/Arduino_LED_Matrix.h b/libraries/Arduino_LED_Matrix/src/Arduino_LED_Matrix.h
index 1aba08419..6d6f01fe7 100644
--- a/libraries/Arduino_LED_Matrix/src/Arduino_LED_Matrix.h
+++ b/libraries/Arduino_LED_Matrix/src/Arduino_LED_Matrix.h
@@ -172,7 +172,7 @@ class ArduinoLEDMatrix
     bool begin() {
         bool rv = true;
         uint8_t type;
-        uint8_t ch = FspTimer::get_available_timer(type);
+        int8_t ch = FspTimer::get_available_timer(type);
         if(ch == -1) {
             return false;
         }