diff --git a/src/include/switch_utils.h b/src/include/switch_utils.h
index c9e2c189c8..92618a81d5 100644
--- a/src/include/switch_utils.h
+++ b/src/include/switch_utils.h
@@ -40,7 +40,18 @@
 
 #include <switch.h>
 
-SWITCH_BEGIN_EXTERN_C SWITCH_DECLARE(int) switch_toupper(int c);
+SWITCH_BEGIN_EXTERN_C 
+
+/* https://code.google.com/p/stringencoders/wiki/PerformanceAscii */
+static inline uint32_t switch_toupper(uint32_t eax)
+{
+    uint32_t ebx = (0x7f7f7f7ful & eax) + 0x05050505ul;
+    ebx = (0x7f7f7f7ful & ebx) + 0x1a1a1a1aul;
+    ebx = ((ebx & ~eax) >> 2 ) & 0x20202020ul;
+    return eax - ebx;
+}
+
+SWITCH_DECLARE(int) old_switch_toupper(int c);
 SWITCH_DECLARE(int) switch_tolower(int c);
 SWITCH_DECLARE(int) switch_isalnum(int c);
 SWITCH_DECLARE(int) switch_isalpha(int c);
diff --git a/src/switch_utils.c b/src/switch_utils.c
index 4335b4dcd3..83b77744a3 100644
--- a/src/switch_utils.c
+++ b/src/switch_utils.c
@@ -2609,7 +2609,7 @@ const short _switch_C_toupper_[1 + SWITCH_CTYPE_NUM_CHARS] = {
 
 const short *_switch_toupper_tab_ = _switch_C_toupper_;
 
-SWITCH_DECLARE(int) switch_toupper(int c)
+SWITCH_DECLARE(int) old_switch_toupper(int c)
 {
 	if ((unsigned int) c > 255)
 		return (c);