diff --git a/src/engine/platform/ym2610.cpp b/src/engine/platform/ym2610.cpp
index 1e5d1f2a..18acd074 100644
--- a/src/engine/platform/ym2610.cpp
+++ b/src/engine/platform/ym2610.cpp
@@ -18,6 +18,7 @@
  */
 
 #include "ym2610.h"
+#include "sound/ymfm/ymfm.h"
 #include "../engine.h"
 #include <string.h>
 #include <math.h>
diff --git a/src/engine/platform/ym2610b.cpp b/src/engine/platform/ym2610b.cpp
index 65b8d723..dde69305 100644
--- a/src/engine/platform/ym2610b.cpp
+++ b/src/engine/platform/ym2610b.cpp
@@ -18,6 +18,7 @@
  */
 
 #include "ym2610b.h"
+#include "sound/ymfm/ymfm.h"
 #include "../engine.h"
 #include <string.h>
 #include <math.h>