diff --git a/bin/build-src-distrib.sh b/bin/build-src-distrib.sh
index 193d6ed9a4614894d5d7daecf0c3ee4fbaf9db5c..d60f1e1b1b48013f55a3facbfca08bbfa065a250 100755
--- a/bin/build-src-distrib.sh
+++ b/bin/build-src-distrib.sh
@@ -14,19 +14,19 @@ DEBUG=no
 # (special use of the 'case' construct)
 if test `echo $BASH_VERSION | sed "s/\([0-9]\).*/\1/" ` -lt 4; then
     echo "bash version >= 4 is required."
-    exit 99
+    exit 127
 fi
 
 # git-lfs needs to be installed
 if ! command -v git-lfs >/dev/null 2>/dev/null; then
     echo "git-lfs is required"
-    exit 99
+    exit 127
 fi
 
 # grep needs to be installed
 if ! command -v grep --version >/dev/null 2>/dev/null; then
     echo "grep is required"
-    exit 99
+    exit 127
 fi
 
 function run {
diff --git a/doc/build-manuals.sh b/doc/build-manuals.sh
index 55c8b1128fd6e01dc6d74f157a71fd94f0dcea45..b4b808f959ad1b458ba7649c47ebd77ca0c57f91 100755
--- a/doc/build-manuals.sh
+++ b/doc/build-manuals.sh
@@ -3,13 +3,13 @@
 # GNU parallel needs to be installed
 if ! command -v parallel >/dev/null 2>/dev/null; then
     echo "parallel is required"
-    exit 99
+    exit 127
 fi
 
 # latexmk needs to be installed
 if ! command -v latexmk >/dev/null 2>/dev/null; then
     echo "latexmk is required"
-    exit 99
+    exit 127
 fi
 
 cd $(dirname $0)