diff --git a/sesman/env.c b/sesman/env.c
index d8eb3106..adbfc788 100644
--- a/sesman/env.c
+++ b/sesman/env.c
@@ -24,9 +24,10 @@
  *
  */
 
+#include <grp.h>
+
 #include "list.h"
 #include "sesman.h"
-#include "grp.h"
 #include "ssl_calls.h"
 
 extern unsigned char g_fixedkey[8]; /* in sesman.c */
diff --git a/sesman/sig.c b/sesman/sig.c
index 579b5876..e93c5947 100644
--- a/sesman/sig.c
+++ b/sesman/sig.c
@@ -24,9 +24,9 @@
  *
  */
 
-#include "sesman.h"
+#include <signal.h>
 
-#include "signal.h"
+#include "sesman.h"
 
 extern int g_sck;
 extern int g_pid;
diff --git a/xrdp/xrdp_mm.c b/xrdp/xrdp_mm.c
index ea719417..ddbc89a8 100644
--- a/xrdp/xrdp_mm.c
+++ b/xrdp/xrdp_mm.c
@@ -29,7 +29,7 @@
 #ifndef USE_NOPAM
 #if defined(HAVE__PAM_TYPES_H)
 #define LINUXPAM 1
-#include "security/_pam_types.h"
+#include <security/_pam_types.h>
 #elif defined(HAVE_PAM_CONSTANTS_H)
 #define OPENPAM 1
 #include <security/pam_constants.h>