diff --git a/src/effects/Effect.cpp b/src/effects/Effect.cpp
index da9a86d69..840e2626c 100644
--- a/src/effects/Effect.cpp
+++ b/src/effects/Effect.cpp
@@ -24,6 +24,8 @@ greater use in future.
 #include "../Audacity.h"
 #include "Effect.h"
 
+#include <algorithm>
+
 #include <wx/defs.h>
 #include <wx/hashmap.h>
 #include <wx/msgdlg.h>
diff --git a/src/effects/Paulstretch.cpp b/src/effects/Paulstretch.cpp
index 4bd37ed2f..c6d5e32a5 100644
--- a/src/effects/Paulstretch.cpp
+++ b/src/effects/Paulstretch.cpp
@@ -17,6 +17,8 @@
 #include "../Audacity.h"
 #include "Paulstretch.h"
 
+#include <algorithm>
+
 #include <math.h>
 #include <float.h>
 
diff --git a/src/effects/TruncSilence.cpp b/src/effects/TruncSilence.cpp
index e57f0c0bd..484dc525e 100644
--- a/src/effects/TruncSilence.cpp
+++ b/src/effects/TruncSilence.cpp
@@ -18,6 +18,8 @@
 #include "../Audacity.h"
 #include "TruncSilence.h"
 
+#include <algorithm>
+
 #include <limits>
 #include <math.h>
 
diff --git a/src/effects/nyquist/Nyquist.cpp b/src/effects/nyquist/Nyquist.cpp
index 5023d9ff6..3e4dd3911 100644
--- a/src/effects/nyquist/Nyquist.cpp
+++ b/src/effects/nyquist/Nyquist.cpp
@@ -26,6 +26,8 @@ effects from this one class.
 
 #include "../../Audacity.h"
 
+#include <algorithm>
+
 #include <math.h>
 #include <locale.h>