diff --git a/js/src/jit/Ion.cpp b/js/src/jit/Ion.cpp
index 777729448e18..5b25568ef99a 100644
--- a/js/src/jit/Ion.cpp
+++ b/js/src/jit/Ion.cpp
@@ -455,9 +455,8 @@ jit::RequestInterruptForIonCode(JSRuntime *rt, JSRuntime::InterruptMode mode)
     }
 }
 
-JitCompartment::JitCompartment(JitRuntime *rt)
-  : rt(rt),
-    stubCodes_(nullptr),
+JitCompartment::JitCompartment()
+  : stubCodes_(nullptr),
     baselineCallReturnAddr_(nullptr),
     baselineGetPropReturnAddr_(nullptr),
     baselineSetPropReturnAddr_(nullptr),
@@ -562,7 +561,7 @@ JitCompartment::mark(JSTracer *trc, JSCompartment *compartment)
     FinishAllOffThreadCompilations(compartment);
 
     // Free temporary OSR buffer.
-    rt->freeOsrTempData();
+    trc->runtime->jitRuntime()->freeOsrTempData();
 }
 
 void
diff --git a/js/src/jit/IonLinker.h b/js/src/jit/IonLinker.h
index 4caf86b46453..4af0d01dbb5b 100644
--- a/js/src/jit/IonLinker.h
+++ b/js/src/jit/IonLinker.h
@@ -78,7 +78,7 @@ class Linker
 
     template <AllowGC allowGC>
     JitCode *newCode(JSContext *cx, JSC::CodeKind kind) {
-        return newCode<allowGC>(cx, cx->compartment()->jitCompartment()->execAlloc(), kind);
+        return newCode<allowGC>(cx, cx->runtime()->jitRuntime()->execAlloc(), kind);
     }
 
     JitCode *newCodeForIonScript(JSContext *cx) {
diff --git a/js/src/jit/JitCompartment.h b/js/src/jit/JitCompartment.h
index da0e09bf8928..6d2158a0911c 100644
--- a/js/src/jit/JitCompartment.h
+++ b/js/src/jit/JitCompartment.h
@@ -245,6 +245,10 @@ class JitRuntime
             flusher_ = fl;
     }
 
+    JSC::ExecutableAllocator *execAlloc() const {
+        return execAlloc_;
+    }
+
     JSC::ExecutableAllocator *getIonAlloc(JSContext *cx) {
         JS_ASSERT(cx->runtime()->currentThreadOwnsInterruptLock());
         return ionAlloc_ ? ionAlloc_ : createIonAlloc(cx);
@@ -336,9 +340,6 @@ class JitCompartment
 {
     friend class JitActivation;
 
-    // Ion state for the compartment's runtime.
-    JitRuntime *rt;
-
     // Map ICStub keys to ICStub shared code objects.
     typedef WeakValueCache<uint32_t, ReadBarriered<JitCode> > ICStubCodeMap;
     ICStubCodeMap *stubCodes_;
@@ -406,7 +407,7 @@ class JitCompartment
     JSC::ExecutableAllocator *createIonAlloc();
 
   public:
-    JitCompartment(JitRuntime *rt);
+    JitCompartment();
     ~JitCompartment();
 
     bool initialize(JSContext *cx);
@@ -417,10 +418,6 @@ class JitCompartment
     void mark(JSTracer *trc, JSCompartment *compartment);
     void sweep(FreeOp *fop);
 
-    JSC::ExecutableAllocator *execAlloc() {
-        return rt->execAlloc_;
-    }
-
     JitCode *stringConcatStub(ExecutionMode mode) const {
         switch (mode) {
           case SequentialExecution: return stringConcatStub_;
diff --git a/js/src/jscompartment.cpp b/js/src/jscompartment.cpp
index c6ecfe4ff72e..0b27e9b68ca5 100644
--- a/js/src/jscompartment.cpp
+++ b/js/src/jscompartment.cpp
@@ -164,12 +164,11 @@ JSCompartment::ensureJitCompartmentExists(JSContext *cx)
     if (jitCompartment_)
         return true;
 
-    JitRuntime *jitRuntime = cx->runtime()->getJitRuntime(cx);
-    if (!jitRuntime)
+    if (!cx->runtime()->getJitRuntime(cx))
         return false;
 
     /* Set the compartment early, so linking works. */
-    jitCompartment_ = cx->new_<JitCompartment>(jitRuntime);
+    jitCompartment_ = cx->new_<JitCompartment>();
 
     if (!jitCompartment_)
         return false;