diff --git a/src/kumir2-libs/stdlib/kumirstdlib.hpp b/src/kumir2-libs/stdlib/kumirstdlib.hpp
index 6daca04547a41f4f5110d37dcea67e76e9e6c218..4bee9d8af5156628bf471604d689618e7d4747d8 100644
--- a/src/kumir2-libs/stdlib/kumirstdlib.hpp
+++ b/src/kumir2-libs/stdlib/kumirstdlib.hpp
@@ -511,34 +511,33 @@ public:
 
     static real maxreal() { return 1.7976931348623157e+308; }
 
-    inline static int div(int a, int b) {
-        if (b<=0) {
-            Core::abort(Core::fromUtf8("Деление на не натуральное число"));
+    static int div(int a, int b)
+    {
+        if (b <= 0) {
+            Core::abort(L"Деление на ненатуральное число");
             return 0;
-        } else {
-            int aa = a;
-            if (aa<0) {
-                unsigned int absolunta = -1*(aa);
-                unsigned int quoti = absolunta / b + 1;
-                aa += quoti * b;
-            }
-            int m = aa % b;
-            return (a-m)/b;
         }
+
+        int q = a / b, r = a % b;
+        if (r < 0)
+            q--;
+        return q;
+
     }
-    inline static int mod(int a, int b) {
-        if (b<=0) {
-            Core::abort(Core::fromUtf8("Деление на не натуральное число"));
+
+    static int mod(int a, int b)
+    {
+        if (b <= 0) {
+            Core::abort(L"Деление на ненатуральное число");
             return 0;
-        } else {
-            if (a<0) {
-                unsigned int absolunta = -1*(a);
-                unsigned int quoti = absolunta / b + 1;
-                a += quoti * b;
-            }
-            return a % b;
         }
+
+        int r = a % b;
+        if (r < 0)
+            r += b;
+        return r;
     }
+
     template <typename T> static int sign(T x) {
         if (x>0) return 1;
         else if (x<0) return -1;