diff --git a/wled00/FX.cpp b/wled00/FX.cpp
index 8c24ab166..fc1d96ce2 100644
--- a/wled00/FX.cpp
+++ b/wled00/FX.cpp
@@ -7909,11 +7909,13 @@ uint8_t WS2812FX::addEffect(uint8_t id, mode_ptr mode_fn, const char *mode_name)
     _mode[id]     = mode_fn;
     _modeData[id] = mode_name;
     return id;
-  } else {
+  } else if(_mode.size() < 255) { // 255 is reserved for indicating the effect wasn't added
     _mode.push_back(mode_fn);
     _modeData.push_back(mode_name);
     if (_modeCount < _mode.size()) _modeCount++;
-    return (_mode.size() <= 255) ? _mode.size() - 1 : 255;
+    return _mode.size() - 1;
+  } else {
+    return 255; // The vector is full so return 255
   }
 }
 
diff --git a/wled00/FX.h b/wled00/FX.h
index b914fec2f..14c19edb7 100644
--- a/wled00/FX.h
+++ b/wled00/FX.h
@@ -772,7 +772,6 @@ class WS2812FX {  // 96 bytes
       show(void),                                 // initiates LED output
       setTargetFps(uint8_t fps),
       setupEffectData(void);                      // add default effects to the list; defined in FX.cpp
-      uint8_t addEffect(uint8_t id, mode_ptr mode_fn, const char *mode_name); // add effect to the list; defined in FX.cpp
 
     inline void restartRuntime()          { for (Segment &seg : _segments) seg.markForReset(); }
     inline void setTransitionMode(bool t) { for (Segment &seg : _segments) seg.startTransition(t ? _transitionDur : 0); }
@@ -808,7 +807,8 @@ class WS2812FX {  // 96 bytes
       getActiveSegmentsNum(void),
       getFirstSelectedSegId(void),
       getLastActiveSegmentId(void),
-      getActiveSegsLightCapabilities(bool selectedOnly = false);
+      getActiveSegsLightCapabilities(bool selectedOnly = false),
+      addEffect(uint8_t id, mode_ptr mode_fn, const char *mode_name);   // add effect to the list; defined in FX.cpp
 
     inline uint8_t getBrightness(void)    { return _brightness; }       // returns current strip brightness
     inline uint8_t getMaxSegments(void)   { return MAX_NUM_SEGMENTS; }  // returns maximum number of supported segments (fixed value)