diff --git a/src/Lib/Array/array.cxx b/src/Lib/Array/array.cxx
index 1287eb79..d7ffb78f 100644
--- a/src/Lib/Array/array.cxx
+++ b/src/Lib/Array/array.cxx
@@ -35,7 +35,7 @@
 // #ifdef HAVE_SYS_STAT_H
 // #  include <sys/stat.h> // stat()
 // #endif
-// #ifdef FG_HAVE_STD_INCLUDES
+// #ifdef SG_HAVE_STD_INCLUDES
 // #  include <cerrno>
 // #else
 // #  include <errno.h>
diff --git a/src/Lib/DEM/dem.cxx b/src/Lib/DEM/dem.cxx
index 515698f3..5d72d9b5 100644
--- a/src/Lib/DEM/dem.cxx
+++ b/src/Lib/DEM/dem.cxx
@@ -37,7 +37,7 @@
 #  include <sys/stat.h> // stat()
 #endif
 
-#ifdef FG_HAVE_STD_INCLUDES
+#ifdef SG_HAVE_STD_INCLUDES
 #  include <cerrno>
 #else
 #  include <errno.h>