diff --git a/src/lib/libc/include/string.h b/src/lib/libc/include/string.h
index a508313..64e29e1 100755
--- a/src/lib/libc/include/string.h
+++ b/src/lib/libc/include/string.h
@@ -1,8 +1,12 @@
 #ifndef _STRING_H
 #define _STRING_H
 
+#include <sys/types.h>
+
 extern void * memcpy(void *, const void *, size_t);
 extern void * memset(void *, int, size_t);
 extern int memcmp(const void *, const void *, size_t);
 
+extern int strlen(const char *);
+
 #endif
diff --git a/src/lib/libc/string/Makefile b/src/lib/libc/string/Makefile
index 00a45dc..8de6beb 100755
--- a/src/lib/libc/string/Makefile
+++ b/src/lib/libc/string/Makefile
@@ -15,7 +15,7 @@
 REMOVE = rm -f
 
 #Objects
-OBJS = memcpy.o memset.o memcmp.o
+OBJS = memcpy.o memset.o memcmp.o strlen.o
 #Output
 OUTPUT = libc.so
 
diff --git a/src/lib/libc/string/strlen.c b/src/lib/libc/string/strlen.c
new file mode 100755
index 0000000..4febfa7
--- /dev/null
+++ b/src/lib/libc/string/strlen.c
@@ -0,0 +1,16 @@
+#include <sys/types.h>
+#include <string.h>
+
+int strlen(const char * string)
+{
+    int i = 0;
+    
+    while (1)
+    {
+	if (string[i] == '\0')
+	    return i;
+	i++;
+    }
+
+    return 0;
+}