diff --git a/configure b/configure
index 60b67373c6..64cac16e40 100755
--- a/configure
+++ b/configure
@@ -90,6 +90,7 @@ SRCS="`< $ROOT_DIR/source.list tr '\r' '\n' | $awk '
 		if ($0 == "PSP"         && "'$os'" != "PSP")               { next; }
 		if ($0 == "DEDICATED"   && "'$enable_dedicated'" != "1")   { next; }
 		if ($0 == "COCOA"       && "'$with_cocoa'" == "0")         { next; }
+		if ($0 == "DOS"         && "'$os'" != "DOS")               { next; }
 		if ($0 == "BEOS"        && "'$os'" != "BEOS")              { next; }
 		if ($0 == "WIN32"       && "'$os'" != "MINGW" &&
 		                "'$os'" != "CYGWIN" && "'$os'" != "MSVC" ) { next; }
diff --git a/projects/generate b/projects/generate
index 035fd0a123..a57803529b 100755
--- a/projects/generate
+++ b/projects/generate
@@ -85,6 +85,7 @@ load_main_data() {
 			if ($0 == "OSX"         && "'$os'" != "OSX")               { next; }
 			if ($0 == "OS2"         && "'$os'" != "OS2")               { next; }
 			if ($0 == "PSP"         && "'$os'" != "PSP")               { next; }
+			if ($0 == "DOS"         && "'$os'" != "DOS")               { next; }
 			if ($0 == "DEDICATED"   && "'$enable_dedicated'" != "1")   { next; }
 			if ($0 == "COCOA"       && "'$with_cocoa'" == "0")         { next; }
 			if ($0 == "BEOS"        && "'$os'" != "BEOS")              { next; }