diff --git a/libraries/Arduino_LED_Matrix/src/Arduino_LED_Matrix.h b/libraries/Arduino_LED_Matrix/src/Arduino_LED_Matrix.h
index 33d0dd81..00f6c945 100644
--- a/libraries/Arduino_LED_Matrix/src/Arduino_LED_Matrix.h
+++ b/libraries/Arduino_LED_Matrix/src/Arduino_LED_Matrix.h
@@ -130,16 +130,6 @@ static void turnLed(int idx, bool on) {
   }
 }
 
-static uint32_t reverse(uint32_t x)
-{
-    x = ((x >> 1) & 0x55555555u) | ((x & 0x55555555u) << 1);
-    x = ((x >> 2) & 0x33333333u) | ((x & 0x33333333u) << 2);
-    x = ((x >> 4) & 0x0f0f0f0fu) | ((x & 0x0f0f0f0fu) << 4);
-    x = ((x >> 8) & 0x00ff00ffu) | ((x & 0x00ff00ffu) << 8);
-    x = ((x >> 16) & 0xffffu) | ((x & 0xffffu) << 16);
-    return x;
-}
-
 // TODO: this is dangerous, use with care
 #define loadSequence(frames)                    loadWrapper(frames, sizeof(frames))
 #define renderBitmap(bitmap, rows, columns)     loadPixels(&bitmap[0][0], rows*columns)
@@ -343,6 +333,15 @@ class ArduinoLEDMatrix
     bool _sequenceDone = false;
     voidFuncPtr _callBack;
 
+    static uint32_t reverse(uint32_t x){
+        x = ((x >> 1) & 0x55555555u) | ((x & 0x55555555u) << 1);
+        x = ((x >> 2) & 0x33333333u) | ((x & 0x33333333u) << 2);
+        x = ((x >> 4) & 0x0f0f0f0fu) | ((x & 0x0f0f0f0fu) << 4);
+        x = ((x >> 8) & 0x00ff00ffu) | ((x & 0x00ff00ffu) << 8);
+        x = ((x >> 16) & 0xffffu) | ((x & 0xffffu) << 16);
+        return x;
+    }
+
     static void turnOnLedISR(timer_callback_args_t *arg) {
         static volatile int i_isr = 0;
         turnLed(i_isr, ((framebuffer[i_isr >> 3] & (1 << (i_isr % 8))) != 0));
diff --git a/libraries/Arduino_LED_Matrix/src/gallery.h b/libraries/Arduino_LED_Matrix/src/gallery.h
index 628b640f..fed40a44 100644
--- a/libraries/Arduino_LED_Matrix/src/gallery.h
+++ b/libraries/Arduino_LED_Matrix/src/gallery.h
@@ -1,3 +1,6 @@
+#ifndef _LEDMATRIX_GALLERY_H_
+#define _LEDMATRIX_GALLERY_H_
+
 /* Icons */
 constexpr uint32_t LEDMATRIX_BLUETOOTH[]     = { 0x10428, 0xa4517ff0, 0x50088104, 66 };
 constexpr uint32_t LEDMATRIX_BOOTLOADER_ON[] = { 0x4015, 0x2482082, 0x81100e0, 66 };
@@ -595,3 +598,5 @@ constexpr uint32_t LEDMATRIX_ANIMATION_HOURGLASS[][4] = {
 	{ 0xe0799f87, 0xf87f87f8, 0x7f99fe07, 50  },
 	{ 0xe0799f87, 0xf83f83f8, 0x7f99fe07, 300 }
 };
+
+#endif // _LEDMATRIX_GALLERY_H_
\ No newline at end of file