diff --git a/src/Airports/runways.cxx b/src/Airports/runways.cxx
index 3eb853823..27caa4f6d 100644
--- a/src/Airports/runways.cxx
+++ b/src/Airports/runways.cxx
@@ -27,6 +27,7 @@
 
 #include <cstdio>              // sprintf()
 #include <cstdlib>             // atoi()
+#include <cassert>
 
 #include <simgear/compiler.h>
 
diff --git a/src/Airports/simple.cxx b/src/Airports/simple.cxx
index af16923b3..249e5a72b 100644
--- a/src/Airports/simple.cxx
+++ b/src/Airports/simple.cxx
@@ -30,6 +30,8 @@
 
 #include "simple.hxx"
 
+#include <cassert>
+
 #include <simgear/misc/sg_path.hxx>
 #include <simgear/props/props.hxx>
 #include <simgear/props/props_io.hxx>
diff --git a/src/Instrumentation/KLN89/kln89_page_apt.cxx b/src/Instrumentation/KLN89/kln89_page_apt.cxx
index 9166db43a..e15b1a45e 100644
--- a/src/Instrumentation/KLN89/kln89_page_apt.cxx
+++ b/src/Instrumentation/KLN89/kln89_page_apt.cxx
@@ -26,6 +26,9 @@
 #endif
 
 #include "kln89_page_apt.hxx"
+
+#include <cassert>
+
 #if ENABLE_ATCDCL
 #    include <ATCDCL/commlist.hxx>
 #else
diff --git a/src/Instrumentation/groundradar.cxx b/src/Instrumentation/groundradar.cxx
index 56c7d0902..ffa2e1fc9 100644
--- a/src/Instrumentation/groundradar.cxx
+++ b/src/Instrumentation/groundradar.cxx
@@ -20,6 +20,8 @@
 #  include "config.h"
 #endif
 
+#include <cassert>
+
 #include <osg/Node>
 #include <osg/Geode>
 #include <osg/Geometry>
diff --git a/utils/GPSsmooth/MIDG-II.cxx b/utils/GPSsmooth/MIDG-II.cxx
index d1cb6d1f5..5ca224d15 100644
--- a/utils/GPSsmooth/MIDG-II.cxx
+++ b/utils/GPSsmooth/MIDG-II.cxx
@@ -2,6 +2,8 @@
 #  include <config.h>
 #endif 
 
+#include <simgear/compiler.h>
+
 #include <iostream>
 
 #include <simgear/constants.h>
diff --git a/utils/GPSsmooth/gps.cxx b/utils/GPSsmooth/gps.cxx
index fd783398f..1d6a79c22 100644
--- a/utils/GPSsmooth/gps.cxx
+++ b/utils/GPSsmooth/gps.cxx
@@ -2,6 +2,8 @@
 #  include <config.h>
 #endif
 
+#include <simgear/compiler.h>
+
 #include <iostream>
 
 #include <simgear/constants.h>