diff --git a/src/add-ons/accelerants/matrox/InitAccelerant.c b/src/add-ons/accelerants/matrox/InitAccelerant.c
index ba03408c58..17e51db1eb 100644
--- a/src/add-ons/accelerants/matrox/InitAccelerant.c
+++ b/src/add-ons/accelerants/matrox/InitAccelerant.c
@@ -11,6 +11,7 @@
 
 #include <string.h>
 #include <unistd.h>
+#include <errno.h>
 #include "acc_std.h"
 
 static status_t init_common(int the_fd);
diff --git a/src/add-ons/accelerants/radeon/InitAccelerant.c b/src/add-ons/accelerants/radeon/InitAccelerant.c
index 796ab0fbd2..a8d242646a 100644
--- a/src/add-ons/accelerants/radeon/InitAccelerant.c
+++ b/src/add-ons/accelerants/radeon/InitAccelerant.c
@@ -11,11 +11,12 @@
 #include "GlobalData.h"
 #include "generic.h"
 
-#include "string.h"
-#include "unistd.h"
-#include "sys/types.h"
-#include "sys/stat.h"
-#include "fcntl.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
 #include <sys/ioctl.h>
 #include <malloc.h>
 #include "CP.h"
diff --git a/src/add-ons/accelerants/vesa/accelerant.cpp b/src/add-ons/accelerants/vesa/accelerant.cpp
index 7f8613e9e7..650444746c 100644
--- a/src/add-ons/accelerants/vesa/accelerant.cpp
+++ b/src/add-ons/accelerants/vesa/accelerant.cpp
@@ -10,6 +10,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <errno.h>
 #include <syslog.h>