diff --git a/modules/juce_core/system/juce_StandardHeader.h b/modules/juce_core/system/juce_StandardHeader.h
index e87e565dfd..fcfd4c22e3 100644
--- a/modules/juce_core/system/juce_StandardHeader.h
+++ b/modules/juce_core/system/juce_StandardHeader.h
@@ -72,6 +72,7 @@
 #include <iostream>
 #include <vector>
 #include <algorithm>
+#include <functional>
 
 #if JUCE_USE_MSVC_INTRINSICS
  #include <intrin.h>