diff --git a/src/scripts/merge_tools/git_hires_merge.sh b/src/scripts/merge_tools/git_hires_merge.sh
index 83d2fad295..e15431ee96 100755
--- a/src/scripts/merge_tools/git_hires_merge.sh
+++ b/src/scripts/merge_tools/git_hires_merge.sh
@@ -13,8 +13,10 @@ clone_dir=$1
 branch1=$2
 branch2=$3
 
+SCRIPTDIR="$(cd "$(dirname "$0")" && pwd -P)"
+
 # Print the current PATH
-echo "PATH: $PATH"
+echo "$0 PATH: $PATH"
 
 cd "$clone_dir" || { echo "$0: cannot cd to $clone_dir from $(pwd)"; exit 2; }
 
@@ -25,7 +27,7 @@ attributes_file=".git/info/attributes"
 echo "* merge=git-hires-merge" >> "$attributes_file"
 
 git config --local merge.git-hires-merge.name "An interactive merge driver for resolving conflicts on individual or adjacent lines"
-git config --local merge.git-hires-merge.driver "git-hires-merge %O %A %B %L %P"
+git config --local merge.git-hires-merge.driver "${SCRIPTDIR}/git-hires-merge %O %A %B %L %P"
 git config --local merge.git-hires-merge.recursive "binary"
 git config --local merge.conflictstyle diff3
 
diff --git a/src/scripts/merge_tools/merge_git_then_plumelib.sh b/src/scripts/merge_tools/merge_git_then_plumelib.sh
index 08d219d1c1..abe746fc20 100755
--- a/src/scripts/merge_tools/merge_git_then_plumelib.sh
+++ b/src/scripts/merge_tools/merge_git_then_plumelib.sh
@@ -19,6 +19,8 @@ branch2=$3
 git_strategy=$4 #"-Xignore-space-change"
 plumelib_strategy=$5 #"--only-adjacent"
 
+SCRIPTDIR="$(cd "$(dirname "$0")" && pwd -P)"
+
 VERBOSE=
 ## Enable for debugging
 # VERBOSE=YES
@@ -55,7 +57,7 @@ fi
 
 git config --local merge.tool merge-plumelib
 # shellcheck disable=SC2016
-git config --local mergetool.merge-plumelib.cmd 'java-merge-tool.sh '"$plumelib_strategy"' ${BASE} ${LOCAL} ${REMOTE} ${MERGED}'
+git config --local mergetool.merge-plumelib.cmd "$SCRIPTDIR"/'java-merge-tool.sh '"$plumelib_strategy"' ${BASE} ${LOCAL} ${REMOTE} ${MERGED}'
 git config --local mergetool.merge-plumelib.trustExitCode true
 
 case "$plumelib_strategy" in
diff --git a/src/scripts/merge_tools/merge_script_then_plumelib.sh b/src/scripts/merge_tools/merge_script_then_plumelib.sh
index d42af44d31..b63d643fb5 100755
--- a/src/scripts/merge_tools/merge_script_then_plumelib.sh
+++ b/src/scripts/merge_tools/merge_script_then_plumelib.sh
@@ -20,6 +20,8 @@ branch2=$3
 merge_script=$4 #"-Xignore-space-change"
 plumelib_strategy=$5 #"--only-adjacent"
 
+SCRIPTDIR="$(cd "$(dirname "$0")" && pwd -P)"
+
 VERBOSE=
 ## Enable for debugging
 # VERBOSE=YES
@@ -56,7 +58,7 @@ fi
 
 git config --local merge.tool merge-plumelib
 # shellcheck disable=SC2016
-git config --local mergetool.merge-plumelib.cmd 'java-merge-tool.sh '"$plumelib_strategy"' ${BASE} ${LOCAL} ${REMOTE} ${MERGED}'
+git config --local mergetool.merge-plumelib.cmd "$SCRIPTDIR"/'java-merge-tool.sh '"$plumelib_strategy"' ${BASE} ${LOCAL} ${REMOTE} ${MERGED}'
 git config --local mergetool.merge-plumelib.trustExitCode true
 
 case "$plumelib_strategy" in