diff --git a/lib/libmixer/mixer.c b/lib/libmixer/mixer.c
index 1a448d222bb7..fe01b92b4c99 100644
--- a/lib/libmixer/mixer.c
+++ b/lib/libmixer/mixer.c
@@ -25,6 +25,7 @@
 #include <sys/types.h>
 #include <sys/ioctl.h>
 #include <sys/sysctl.h>
+#include <sys/soundcard.h>
 
 #include <errno.h>
 #include <fcntl.h>
diff --git a/lib/libmixer/mixer.h b/lib/libmixer/mixer.h
index 6e77fdec421f..957074543e75 100644
--- a/lib/libmixer/mixer.h
+++ b/lib/libmixer/mixer.h
@@ -27,7 +27,6 @@
 
 #include <sys/cdefs.h>
 #include <sys/queue.h>
-#include <sys/soundcard.h>
 
 #include <limits.h>