diff --git a/sys/dev/dc/dcphy.c b/sys/dev/dc/dcphy.c
index ad2599c69583..2e0e77ef2798 100644
--- a/sys/dev/dc/dcphy.c
+++ b/sys/dev/dc/dcphy.c
@@ -61,6 +61,7 @@
 #include <machine/bus_pio.h>
 #include <machine/bus_memio.h>
 #include <machine/bus.h>
+#include <machine/mutex.h>
 #include <machine/resource.h>
 #include <sys/bus.h>
 
diff --git a/sys/dev/dc/pnphy.c b/sys/dev/dc/pnphy.c
index 583cce92404e..12737dec8b88 100644
--- a/sys/dev/dc/pnphy.c
+++ b/sys/dev/dc/pnphy.c
@@ -59,6 +59,7 @@
 #include <machine/bus_pio.h>
 #include <machine/bus_memio.h>
 #include <machine/bus.h>
+#include <machine/mutex.h>
 #include <machine/resource.h>
 #include <sys/bus.h>
 
diff --git a/sys/dev/mii/dcphy.c b/sys/dev/mii/dcphy.c
index ad2599c69583..2e0e77ef2798 100644
--- a/sys/dev/mii/dcphy.c
+++ b/sys/dev/mii/dcphy.c
@@ -61,6 +61,7 @@
 #include <machine/bus_pio.h>
 #include <machine/bus_memio.h>
 #include <machine/bus.h>
+#include <machine/mutex.h>
 #include <machine/resource.h>
 #include <sys/bus.h>
 
diff --git a/sys/dev/mii/pnphy.c b/sys/dev/mii/pnphy.c
index 583cce92404e..12737dec8b88 100644
--- a/sys/dev/mii/pnphy.c
+++ b/sys/dev/mii/pnphy.c
@@ -59,6 +59,7 @@
 #include <machine/bus_pio.h>
 #include <machine/bus_memio.h>
 #include <machine/bus.h>
+#include <machine/mutex.h>
 #include <machine/resource.h>
 #include <sys/bus.h>