diff --git a/js/src/ion/AsmJS.cpp b/js/src/ion/AsmJS.cpp
index 0bae47fc2f16..9d7ff522b561 100644
--- a/js/src/ion/AsmJS.cpp
+++ b/js/src/ion/AsmJS.cpp
@@ -4597,7 +4597,7 @@ CheckVariableDecls(ModuleCompiler &m, FunctionCompiler::LocalMap *locals, ParseN
 {
     ParseNode *stmt = *stmtIter;
 
-    for (; stmt && stmt->isKind(PNK_VAR); stmt = NextNode(stmt)) {
+    for (; stmt && stmt->isKind(PNK_VAR); stmt = NextNonEmptyStatement(stmt)) {
         for (ParseNode *var = VarListHead(stmt); var; var = NextNode(var)) {
             if (!CheckVariableDecl(m, var, locals))
                 return false;
diff --git a/js/src/jit-test/tests/asm.js/testBasic.js b/js/src/jit-test/tests/asm.js/testBasic.js
index 9d0ddc861400..7d6a5dd49a61 100644
--- a/js/src/jit-test/tests/asm.js/testBasic.js
+++ b/js/src/jit-test/tests/asm.js/testBasic.js
@@ -34,6 +34,7 @@ assertEq(asmLink(asmCompile('x', USE_ASM + 'function f(){} return f'), 1)(), und
 assertEq(asmLink(asmCompile('x','y', USE_ASM + 'function f(){} return f'), 1, 2)(), undefined);
 
 assertEq(asmLink(asmCompile(USE_ASM + 'function f(i) {i=i|0} return f'))(42), undefined);
+assertEq(asmLink(asmCompile(USE_ASM + 'function f() {var i=0;; var j=1;} return f'))(), undefined); // bug 877965 second part
 assertAsmTypeFail(USE_ASM + 'function f(i) {i=i|0;var i} return f');
 assertAsmTypeFail(USE_ASM + 'function f(i) {i=i|0;var i=0} return f');