diff --git a/libguac/include/protocol.h b/libguac/include/protocol.h
index 5c957819..2b347b1c 100755
--- a/libguac/include/protocol.h
+++ b/libguac/include/protocol.h
@@ -104,42 +104,42 @@ typedef enum guac_composite_mode {
      */
 
     /* Constant functions */            /* ABCD */
-	GUAC_COMP_BINARY_BLACK      = 0x10, /* 0000 */
-	GUAC_COMP_BINARY_WHITE      = 0x1F, /* 1111 */
+    GUAC_COMP_BINARY_BLACK      = 0x10, /* 0000 */
+    GUAC_COMP_BINARY_WHITE      = 0x1F, /* 1111 */
 
     /* Copy functions */
-	GUAC_COMP_BINARY_SRC        = 0x13, /* 0011 */
-	GUAC_COMP_BINARY_DEST       = 0x15, /* 0101 */
-	GUAC_COMP_BINARY_NSRC       = 0x1C, /* 1100 */
-	GUAC_COMP_BINARY_NDEST      = 0x1A, /* 1010 */
+    GUAC_COMP_BINARY_SRC        = 0x13, /* 0011 */
+    GUAC_COMP_BINARY_DEST       = 0x15, /* 0101 */
+    GUAC_COMP_BINARY_NSRC       = 0x1C, /* 1100 */
+    GUAC_COMP_BINARY_NDEST      = 0x1A, /* 1010 */
 
     /* AND / NAND */
-	GUAC_COMP_BINARY_AND        = 0x11, /* 0001 */
-	GUAC_COMP_BINARY_NAND       = 0x1E, /* 1110 */
+    GUAC_COMP_BINARY_AND        = 0x11, /* 0001 */
+    GUAC_COMP_BINARY_NAND       = 0x1E, /* 1110 */
 
     /* OR / NOR */
-	GUAC_COMP_BINARY_OR         = 0x17, /* 0111 */
-	GUAC_COMP_BINARY_NOR        = 0x18, /* 1000 */
+    GUAC_COMP_BINARY_OR         = 0x17, /* 0111 */
+    GUAC_COMP_BINARY_NOR        = 0x18, /* 1000 */
 
     /* XOR / XNOR */
-	GUAC_COMP_BINARY_XOR        = 0x16, /* 0110 */
-	GUAC_COMP_BINARY_XNOR       = 0x19, /* 1001 */
+    GUAC_COMP_BINARY_XOR        = 0x16, /* 0110 */
+    GUAC_COMP_BINARY_XNOR       = 0x19, /* 1001 */
 
     /* AND / NAND with inverted source */
-	GUAC_COMP_BINARY_NSRC_AND   = 0x14, /* 0100 */
-	GUAC_COMP_BINARY_NSRC_NAND  = 0x1B, /* 1011 */
+    GUAC_COMP_BINARY_NSRC_AND   = 0x14, /* 0100 */
+    GUAC_COMP_BINARY_NSRC_NAND  = 0x1B, /* 1011 */
 
     /* OR / NOR with inverted source */
-	GUAC_COMP_BINARY_NSRC_OR    = 0x1D, /* 1101 */
-	GUAC_COMP_BINARY_NSRC_NOR   = 0x12, /* 0010 */
+    GUAC_COMP_BINARY_NSRC_OR    = 0x1D, /* 1101 */
+    GUAC_COMP_BINARY_NSRC_NOR   = 0x12, /* 0010 */
 
     /* AND / NAND with inverted destination */
-	GUAC_COMP_BINARY_NDEST_AND  = 0x12, /* 0010 */
-	GUAC_COMP_BINARY_NDEST_NAND = 0x1D, /* 1101 */
+    GUAC_COMP_BINARY_NDEST_AND  = 0x12, /* 0010 */
+    GUAC_COMP_BINARY_NDEST_NAND = 0x1D, /* 1101 */
 
     /* OR / NOR with inverted destination */
-	GUAC_COMP_BINARY_NDEST_OR   = 0x1B, /* 1011 */
-	GUAC_COMP_BINARY_NDEST_NOR  = 0x14  /* 0100 */
+    GUAC_COMP_BINARY_NDEST_OR   = 0x1B, /* 1011 */
+    GUAC_COMP_BINARY_NDEST_NOR  = 0x14  /* 0100 */
 
 } guac_composite_mode;