diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/CodegenUtil.java b/compiler/backend/src/org/jetbrains/jet/codegen/CodegenUtil.java
index 6206e98f98b..c7add487473 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/CodegenUtil.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/CodegenUtil.java
@@ -535,4 +535,33 @@ public class CodegenUtil {
             }
         }
     }
+
+    public static Type genIncrement(Type expectedType, int myDelta, InstructionAdapter v) {
+        if (expectedType == Type.LONG_TYPE) {
+            //noinspection UnnecessaryBoxing
+            v.lconst(myDelta);
+        }
+        else if (expectedType == Type.FLOAT_TYPE) {
+            //noinspection UnnecessaryBoxing
+            v.fconst(myDelta);
+        }
+        else if (expectedType == Type.DOUBLE_TYPE) {
+            //noinspection UnnecessaryBoxing
+            v.dconst(myDelta);
+        }
+        else {
+            v.iconst(myDelta);
+            expectedType = Type.INT_TYPE;
+        }
+        v.add(expectedType);
+        return expectedType;
+    }
+
+    public static Type genNegate(Type expectedType, InstructionAdapter v) {
+        if (expectedType == Type.BYTE_TYPE || expectedType == Type.SHORT_TYPE || expectedType == Type.CHAR_TYPE) {
+            expectedType = Type.INT_TYPE;
+        }
+        v.neg(expectedType);
+        return expectedType;
+    }
 }
diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java b/compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java
index f29534d7d58..093b187f77c 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java
@@ -2683,23 +2683,7 @@ public class ExpressionCodegen extends JetVisitor<StackValue, StackValue> implem
         StackValue value = genQualified(receiver, operand);
         value.dupReceiver(v);
         value.put(asmType, v);
-        if (asmType == Type.LONG_TYPE) {
-            //noinspection UnnecessaryBoxing
-            v.lconst(increment);
-        }
-        else if (asmType == Type.FLOAT_TYPE) {
-            //noinspection UnnecessaryBoxing
-            v.fconst(increment);
-        }
-        else if (asmType == Type.DOUBLE_TYPE) {
-            //noinspection UnnecessaryBoxing
-            v.dconst(increment);
-        }
-        else {
-            v.iconst(increment);
-            asmType = Type.INT_TYPE;
-        }
-        v.add(asmType);
+        asmType = genIncrement(asmType, increment, v);
         value.store(asmType, v);
     }
 
diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/StackValue.java b/compiler/backend/src/org/jetbrains/jet/codegen/StackValue.java
index 7b2bb249545..5c1c83a1ff1 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/StackValue.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/StackValue.java
@@ -252,7 +252,7 @@ public abstract class StackValue {
         coerce(topOfStackType, this.type, v);
     }
 
-    protected static void coerce(Type fromType, Type toType, InstructionAdapter v) {
+    public static void coerce(Type fromType, Type toType, InstructionAdapter v) {
         if (toType.equals(fromType)) return;
 
         if (toType.getSort() == Type.VOID && fromType.getSort() != Type.VOID) {
diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/Increment.java b/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/Increment.java
index 04063d3160d..607947502f5 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/Increment.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/Increment.java
@@ -70,30 +70,13 @@ public class Increment implements IntrinsicMethod {
             value.dupReceiver(v);
 
             value.put(expectedType, v);
-            plusMinus(v, expectedType);
-            value.store(expectedType, v);
+            value.store(CodegenUtil.genIncrement(expectedType, myDelta, v), v);
             value.put(expectedType, v);
         }
         else {
             receiver.put(expectedType, v);
-            plusMinus(v, expectedType);
+            StackValue.coerce(CodegenUtil.genIncrement(expectedType, myDelta, v), expectedType, v);
         }
         return StackValue.onStack(expectedType);
     }
-
-    private void plusMinus(InstructionAdapter v, Type expectedType) {
-        if (expectedType == Type.LONG_TYPE) {
-            v.lconst(myDelta);
-        }
-        else if (expectedType == Type.FLOAT_TYPE) {
-            v.fconst(myDelta);
-        }
-        else if (expectedType == Type.DOUBLE_TYPE) {
-            v.dconst(myDelta);
-        }
-        else {
-            v.iconst(myDelta);
-        }
-        v.add(expectedType);
-    }
 }
diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/UnaryMinus.java b/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/UnaryMinus.java
index 91b534a3455..f56354f38a6 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/UnaryMinus.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/UnaryMinus.java
@@ -52,7 +52,7 @@ public class UnaryMinus implements IntrinsicMethod {
         else {
             receiver.put(expectedType, v);
         }
-        v.neg(expectedType);
+        StackValue.coerce(CodegenUtil.genNegate(expectedType, v), expectedType, v);
         return StackValue.onStack(expectedType);
     }
 }
diff --git a/compiler/testData/codegen/regressions/kt2251.kt b/compiler/testData/codegen/regressions/kt2251.kt
index 1858ff479e7..f331f062738 100644
--- a/compiler/testData/codegen/regressions/kt2251.kt
+++ b/compiler/testData/codegen/regressions/kt2251.kt
@@ -1,4 +1,10 @@
+class A(var b: Byte) {
+  fun c(d: Short)  = (b + d.toByte()).toChar()
+}
+
 fun box() : String {
+    if(A(10.toByte()).c(20.toShort()) != 30.toByte().toChar()) return "plus failed"
+
     var x = 20.toByte()
     var y = 20.toByte()
     val foo = {