diff --git a/src/tm1637.cpp b/src/tm1637.cpp
index ea1198a..55a6205 100644
--- a/src/tm1637.cpp
+++ b/src/tm1637.cpp
@@ -56,7 +56,7 @@ void TM1637::setColon([[maybe_unused]] bool on)
 {
     static constexpr size_t CONTROL_DISPLAY = 0x80'00;
 
-    // is_colon = true;
+    m_isColon = on;
 
     if (on)
         m_currentSegments |= CONTROL_DISPLAY;
@@ -147,4 +147,4 @@ void TM1637::displaySpeed(uint8_t speed)
         setColon(m_isColon);
     }
     send4Bytes(m_currentSegments);
-}
\ No newline at end of file
+}