diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/NumberTest.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/NumberTest.java
index 4e12d5dbe11..1eeebca948c 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/NumberTest.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/NumberTest.java
@@ -50,6 +50,11 @@ public final class NumberTest extends SingleFileTranslationTest {
         checkFooBoxIsOk();
     }
 
+    // KT-5345 Type mismatch on Int / Float division
+    public void testIntDivFloat() throws Exception {
+        checkFooBoxIsOk();
+    }
+
     public void testHexademicalConstant() throws Exception {
         try {
             fooBoxTest();
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/factories/PrimitiveBinaryOperationFIF.java b/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/factories/PrimitiveBinaryOperationFIF.java
index 067aaebf2dc..0b728cc253a 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/factories/PrimitiveBinaryOperationFIF.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/intrinsic/functions/factories/PrimitiveBinaryOperationFIF.java
@@ -24,7 +24,9 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.descriptors.FunctionDescriptor;
 import org.jetbrains.jet.lang.resolve.name.Name;
+import org.jetbrains.jet.lang.types.JetType;
 import org.jetbrains.jet.lang.types.expressions.OperatorConventions;
+import org.jetbrains.jet.lang.types.lang.KotlinBuiltIns;
 import org.jetbrains.jet.lexer.JetToken;
 import org.jetbrains.k2js.translate.context.TranslationContext;
 import org.jetbrains.k2js.translate.intrinsic.functions.basic.FunctionIntrinsic;
@@ -101,7 +103,10 @@ public enum PrimitiveBinaryOperationFIF implements FunctionIntrinsicFactory {
         }
 
         if (pattern(INTEGER_NUMBER_TYPES + ".div").apply(descriptor)) {
-            return INTEGER_DIVISION_INTRINSIC;
+            JetType resultType = descriptor.getReturnType();
+            if (!KotlinBuiltIns.getInstance().getFloatType().equals(resultType) &&
+                !KotlinBuiltIns.getInstance().getDoubleType().equals(resultType))
+                return INTEGER_DIVISION_INTRINSIC;
         }
         if (descriptor.getName().equals(Name.identifier("rangeTo"))) {
             return RANGE_TO_INTRINSIC;
diff --git a/js/js.translator/testData/number/cases/intDivFloat.kt b/js/js.translator/testData/number/cases/intDivFloat.kt
new file mode 100644
index 00000000000..de57a180b30
--- /dev/null
+++ b/js/js.translator/testData/number/cases/intDivFloat.kt
@@ -0,0 +1,18 @@
+// http://youtrack.jetbrains.com/issue/KT-5345
+// KT-5345 (Javascript) Type mismatch on Int / Float division
+// If any of Number operands is floating-point, the result should be float too.
+
+package foo
+
+fun box(): String {
+    assertEquals(0.5f, 1 / 2.0f, "Int / Float")
+    assertEquals(0.5, 1 / 2.0, "Int / Double")
+
+    assertEquals(0.5f, (1: Short) / 2.0f, "Short / Float")
+    assertEquals(0.5, (1: Short) / 2.0, "Short / Double")
+
+    assertEquals(0.5f, (1: Byte) / 2.0f, "Byte / Float")
+    assertEquals(0.5, (1: Byte) / 2.0, "Byte / Double")
+
+    return "OK"
+}
\ No newline at end of file