diff --git a/include/unicorn/unicorn.h b/include/unicorn/unicorn.h
index bc2e1d29..ab1e65bb 100644
--- a/include/unicorn/unicorn.h
+++ b/include/unicorn/unicorn.h
@@ -93,7 +93,7 @@ typedef enum uc_mode {
     UC_MODE_THUMB = 1 << 4,       // ARM's Thumb mode, including Thumb-2
     UC_MODE_MCLASS = 1 << 5,      // ARM's Cortex-M series (currently unsupported)
     UC_MODE_V8 = 1 << 6,          // ARMv8 A32 encodings for ARM (currently unsupported)
-    UC_MODE_ARM_MASK = UC_MODE_ARM|UC_MODE_THUMB|UC_MODE_MCLASS|UC_MODE_MCLASS|UC_MODE_LITTLE_ENDIAN|UC_MODE_BIG_ENDIAN,
+    UC_MODE_ARM_MASK = UC_MODE_ARM|UC_MODE_THUMB|UC_MODE_LITTLE_ENDIAN,
     // mips
     UC_MODE_MICRO = 1 << 4,       // MicroMips mode
     UC_MODE_MIPS3 = 1 << 5,       // Mips III ISA
@@ -105,16 +105,16 @@ typedef enum uc_mode {
     UC_MODE_16 = 1 << 1,          // 16-bit mode
     UC_MODE_32 = 1 << 2,          // 32-bit mode
     UC_MODE_64 = 1 << 3,          // 64-bit mode
-    UC_MODE_X86_MASK = UC_MODE_16|UC_MODE_32|UC_MODE_64|UC_MODE_LITTLE_ENDIAN|UC_MODE_BIG_ENDIAN,
+    UC_MODE_X86_MASK = UC_MODE_16|UC_MODE_32|UC_MODE_64|UC_MODE_LITTLE_ENDIAN,
     // ppc 
     UC_MODE_PPC64 = 1 << 3,       // 64-bit mode
     UC_MODE_QPX = 1 << 4,         // Quad Processing eXtensions mode
-    UC_MODE_PPC_MASK = UC_MODE_PPC64|UC_MODE_QPX|UC_MODE_LITTLE_ENDIAN|UC_MODE_BIG_ENDIAN,
+    UC_MODE_PPC_MASK = UC_MODE_PPC64|UC_MODE_QPX|UC_MODE_LITTLE_ENDIAN,
     // sparc
     UC_MODE_V9 = 1 << 4,          // SparcV9 mode
-    UC_MODE_SPARC_MASK = UC_MODE_V9|UC_MODE_LITTLE_ENDIAN|UC_MODE_BIG_ENDIAN,
+    UC_MODE_SPARC_MASK = UC_MODE_V9|UC_MODE_LITTLE_ENDIAN,
     // m68k
-    UC_MODE_M68K_MASK = UC_MODE_LITTLE_ENDIAN|UC_MODE_BIG_ENDIAN,
+    UC_MODE_M68K_MASK = UC_MODE_LITTLE_ENDIAN,
 } uc_mode;
 
 // All type of errors encountered by Unicorn API.