diff --git a/src/backend/postgres/PostgresBackend.c b/src/backend/postgres/PostgresBackend.c
index 9d51ee1c37..69e5daab43 100644
--- a/src/backend/postgres/PostgresBackend.c
+++ b/src/backend/postgres/PostgresBackend.c
@@ -30,6 +30,7 @@
 #include <netdb.h>
 #include <pwd.h>
 #include <stdio.h>  
+#include <stdlib.h>  
 #include <string.h>  
 #include <sys/types.h>  
 #include <unistd.h>  
diff --git a/src/backend/postgres/account.c b/src/backend/postgres/account.c
index aa469a50a7..8bd9364946 100644
--- a/src/backend/postgres/account.c
+++ b/src/backend/postgres/account.c
@@ -26,6 +26,7 @@
 #include "config.h"
 
 #include <glib.h>
+#include <stdlib.h>  
 #include <string.h>  
 
 #include <libpq-fe.h>  
diff --git a/src/backend/postgres/book.c b/src/backend/postgres/book.c
index c6ceb62687..5b38121042 100644
--- a/src/backend/postgres/book.c
+++ b/src/backend/postgres/book.c
@@ -26,6 +26,7 @@
 #include "config.h"
 
 #include <glib.h>
+#include <stdlib.h>  
 #include <string.h>  
 
 #include <libpq-fe.h>  
diff --git a/src/backend/postgres/events.c b/src/backend/postgres/events.c
index f120df320c..9f283c1311 100644
--- a/src/backend/postgres/events.c
+++ b/src/backend/postgres/events.c
@@ -26,6 +26,7 @@
 #include "config.h"
 
 #include <libpq-fe.h>  
+#include <stdlib.h>  
 
 #include "Backend.h"
 #include "BackendP.h"
diff --git a/src/backend/postgres/putil.c b/src/backend/postgres/putil.c
index aeddbd88c3..57fa236308 100644
--- a/src/backend/postgres/putil.c
+++ b/src/backend/postgres/putil.c
@@ -33,6 +33,7 @@
 
 #include <glib.h> 
 #include <libpq-fe.h>  
+#include <stdlib.h>  
 #include "Backend.h"
 #include "BackendP.h"
 #include "gnc-engine-util.h" 
diff --git a/src/backend/postgres/upgrade.c b/src/backend/postgres/upgrade.c
index 45257457a7..55efc002eb 100644
--- a/src/backend/postgres/upgrade.c
+++ b/src/backend/postgres/upgrade.c
@@ -26,6 +26,7 @@
 #include "config.h"
 
 #include <libpq-fe.h> 
+#include <stdlib.h>  
 
 #include "PostgresBackend.h"
 #include "upgrade.h"