diff --git a/js/public/ProfilingStack.h b/js/public/ProfilingStack.h
index c67f98952cbd..213e47bb7dec 100644
--- a/js/public/ProfilingStack.h
+++ b/js/public/ProfilingStack.h
@@ -50,15 +50,15 @@ class ProfileEntry
     // instances are volatile. These methods would not be available unless they
     // were marked as volatile as well.
 
-    bool js() volatile {
+    bool js() const volatile {
         JS_ASSERT_IF(sp == nullptr, script_ != nullptr);
         return sp == nullptr;
     }
 
-    uint32_t line() volatile { JS_ASSERT(!js()); return idx; }
-    JSScript *script() volatile { JS_ASSERT(js()); return script_; }
-    void *stackAddress() volatile { return sp; }
-    const char *label() volatile { return string; }
+    uint32_t line() const volatile { JS_ASSERT(!js()); return idx; }
+    JSScript *script() const volatile { JS_ASSERT(js()); return script_; }
+    void *stackAddress() const volatile { return sp; }
+    const char *label() const volatile { return string; }
 
     void setLine(uint32_t aLine) volatile { JS_ASSERT(!js()); idx = aLine; }
     void setLabel(const char *aString) volatile { string = aString; }
@@ -66,7 +66,7 @@ class ProfileEntry
     void setScript(JSScript *aScript) volatile { script_ = aScript; }
 
     // We can't know the layout of JSScript, so look in vm/SPSProfiler.cpp.
-    JS_FRIEND_API(jsbytecode *) pc() volatile;
+    JS_FRIEND_API(jsbytecode *) pc() const volatile;
     JS_FRIEND_API(void) setPC(jsbytecode *pc) volatile;
 
     static size_t offsetOfString() { return offsetof(ProfileEntry, string); }
diff --git a/js/src/vm/SPSProfiler.cpp b/js/src/vm/SPSProfiler.cpp
index 0ba9c84b96be..8ad37bddbd23 100644
--- a/js/src/vm/SPSProfiler.cpp
+++ b/js/src/vm/SPSProfiler.cpp
@@ -269,7 +269,7 @@ SPSEntryMarker::~SPSEntryMarker()
 }
 
 JS_FRIEND_API(jsbytecode*)
-ProfileEntry::pc() volatile
+ProfileEntry::pc() const volatile
 {
     JS_ASSERT_IF(idx != NullPCIndex, idx >= 0 && uint32_t(idx) < script()->length);
     return idx == NullPCIndex ? nullptr : script()->code + idx;
diff --git a/tools/profiler/PseudoStack.h b/tools/profiler/PseudoStack.h
index 6e271c080ca2..2da8fcefa743 100644
--- a/tools/profiler/PseudoStack.h
+++ b/tools/profiler/PseudoStack.h
@@ -80,7 +80,7 @@ class StackEntry : public js::ProfileEntry
 {
 public:
 
-  bool isCopyLabel() volatile {
+  bool isCopyLabel() const volatile {
     return !((uintptr_t)stackAddress() & 0x1);
   }