diff --git a/ruamoko/include/string.h b/ruamoko/include/string.h
index e7ba66ba1..fab2daf6b 100644
--- a/ruamoko/include/string.h
+++ b/ruamoko/include/string.h
@@ -22,7 +22,7 @@ string str_lower (string str);
 string str_upper (string str);
 double strtod (string str, int *end);
 float strtof (string str, int *end);
-long strtol (string str, int *end);
-unsigned long strtoul (string str, int *end);
+long strtol (string str, int *end, int base);
+unsigned long strtoul (string str, int *end, int base);
 
 #endif//__ruamoko_string_h
diff --git a/ruamoko/lib/string.r b/ruamoko/lib/string.r
index 3780b5f03..0e0cb6b3b 100644
--- a/ruamoko/lib/string.r
+++ b/ruamoko/lib/string.r
@@ -21,5 +21,5 @@ string str_lower (string str) = #0;
 string str_upper (string str) = #0;
 double strtod (string str, int *end) = #0;
 float strtof (string str, int *end) = #0;
-long strtol (string str, int *end) = #0;
-unsigned long strtoul (string str, int *end) = #0;
+long strtol (string str, int *end, int base) = #0;
+unsigned long strtoul (string str, int *end, int base) = #0;