diff --git a/src/xtoa.c b/src/xtoa.c
index 3cf1990..aaf7b69 100644
--- a/src/xtoa.c
+++ b/src/xtoa.c
@@ -24,6 +24,30 @@ char* itoa(int value, int base) {
     }
     return result;
 }
+char* uitoa(unsigned int value, int base) {
+    char* result;
+
+    // check that the base if valid
+    if (base < 2 || base > 36) { *result = '\0'; return result; }
+
+    char* ptr = result, *ptr1 = result, tmp_char;
+    int tmp_value;
+
+    do {
+        tmp_value = value;
+        value /= base;
+        *ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz" [35 + (tmp_value - value * base)];
+    } while ( value );
+
+
+    *ptr-- = '\0';
+    while(ptr1 < ptr) {
+        tmp_char = *ptr;
+        *ptr--= *ptr1;
+        *ptr1++ = tmp_char;
+    }
+    return result;
+}
 char* ltoa(long value, int base) {
     char* result;
 
diff --git a/src/xtoa.h b/src/xtoa.h
index 80445fa..710c774 100644
--- a/src/xtoa.h
+++ b/src/xtoa.h
@@ -2,6 +2,7 @@
 #define HEADER_XTOA
 
 char* itoa(int value, int base);
+char* uitoa(unsigned int value, int base);
 char* ltoa(long value, int base);
 char* ultoa(unsigned long value, int base);