diff --git a/TOOLS/idet.sh b/TOOLS/idet.sh
index 983052c822..3e57a3df33 100755
--- a/TOOLS/idet.sh
+++ b/TOOLS/idet.sh
@@ -30,7 +30,7 @@ testfun()
 
 judge()
 {
-    out=`testfun "$@"`
+    out="$(testfun "$@")"
 
     tff=${out##* TFF:}; tff=${tff%% *}
     bff=${out##* BFF:}; bff=${bff%% *}
diff --git a/version.sh b/version.sh
index bd8ca48741..37802c6571 100755
--- a/version.sh
+++ b/version.sh
@@ -21,7 +21,7 @@ done
 # Extract revision number from file used by daily tarball snapshots
 # or from "git describe" output
 git_revision=$(cat snapshot_version 2> /dev/null)
-test $git_revision || test ! -e .git || git_revision=`git rev-parse --short HEAD`
+test $git_revision || test ! -e .git || git_revision=$(git rev-parse --short HEAD)
 test $git_revision && git_revision=git-$git_revision
 version="$git_revision"