diff --git a/js/src/gc/GCRuntime.h b/js/src/gc/GCRuntime.h
index cc558c2db9..0e6969055a 100644
--- a/js/src/gc/GCRuntime.h
+++ b/js/src/gc/GCRuntime.h
@@ -600,8 +600,6 @@ class GCRuntime
     void finishRoots();
     void finish();
 
-    inline bool needZealousGC();
-
     MOZ_MUST_USE bool addRoot(Value* vp, const char* name);
     void removeRoot(Value* vp);
     void setMarkStackLimit(size_t limit, AutoLockGC& lock);
@@ -1352,8 +1350,6 @@ class MOZ_RAII AutoMaybeStartBackgroundAllocation
     }
 };
 
-inline bool GCRuntime::needZealousGC() { return false; }
-
 } /* namespace gc */
 
 } /* namespace js */