diff --git a/js/src/jit-test/tests/basic/bug642758.js b/js/src/jit-test/tests/basic/bug642758.js
new file mode 100644
index 000000000000..e92e657309a2
--- /dev/null
+++ b/js/src/jit-test/tests/basic/bug642758.js
@@ -0,0 +1,4 @@
+function Integer( value, exception ) { }
+try {
+new Integer( Math.LN2, ++INVALID_INTEGER_VALUE? exception+1.1: 1900 );
+} catch (e) {}
diff --git a/js/src/methodjit/FastArithmetic.cpp b/js/src/methodjit/FastArithmetic.cpp
index e7c6c7525b07..e3c7a3766663 100644
--- a/js/src/methodjit/FastArithmetic.cpp
+++ b/js/src/methodjit/FastArithmetic.cpp
@@ -378,7 +378,6 @@ mjit::Compiler::jsop_binary_double(FrameEntry *lhs, FrameEntry *rhs, JSOp op,
          * Call a stub and try harder to convert to int32, or failing that trigger
          * recompilation of this script.
          */
-        JS_ASSERT(op == JSOP_DIV);
         stubcc.linkExit(masm.jump(), Uses(2));
     } else if (type != JSVAL_TYPE_DOUBLE) {
         masm.storeDouble(fpLeft, frame.addressOf(lhs));