diff --git a/compat53/module.lua b/compat53/module.lua
index 225d8ca..67b2a4a 100644
--- a/compat53/module.lua
+++ b/compat53/module.lua
@@ -115,6 +115,7 @@ if lua_version < "5.3" then
       M.math.mininteger = minint
 
       function M.math.tointeger(n)
+         n = tonumber(n)
          if type(n) == "number" and n <= maxint and n >= minint and n % 1 == 0 then
             return n
          end
diff --git a/tests/test.lua b/tests/test.lua
index 443f6f7..ddc00fe 100755
--- a/tests/test.lua
+++ b/tests/test.lua
@@ -228,6 +228,7 @@ print("math.mininteger", math.mininteger-1 < math.mininteger)
 ___''
 print("math.tointeger", math.tointeger(0))
 print("math.tointeger", math.tointeger(math.pi))
+print("math.tointeger", math.tointeger("123"))
 print("math.tointeger", math.tointeger("hello"))
 print("math.tointeger", math.tointeger(math.maxinteger+2.0))
 print("math.tointeger", math.tointeger(math.mininteger*2.0))