diff --git a/script/get_git_rev.sh b/script/get_git_rev.sh
index 1b6ac077..61813b1c 100755
--- a/script/get_git_rev.sh
+++ b/script/get_git_rev.sh
@@ -3,12 +3,13 @@
 DIR=$1
 FILE=$2
 GIT=$(which git)
+SED=$(which sed)
 
 if [ -d "${DIR}/.git/" ] && [ -n "${GIT}" ]
 then
     echo -n "#define GIT_VERSION \"" > "${FILE}.tmp"
-    BRTG="$(${GIT} describe --tags --always --all | sed -e 's:heads/::')"
-    REV="$(${GIT} describe --tags --always --dirty| sed -e 's:-g\([a-f0-9]\{7\}\):-git-\1:g')"
+    BRTG="$(${GIT} describe --tags --always --all | ${SED} -e 's:heads/::')"
+    REV="$(${GIT} describe --tags --always --dirty| ${SED} -e 's:-g\([a-f0-9]\{7\}\):-git-\1:g')"
     echo -n "${REV} (${BRTG})" >> "${FILE}.tmp"
     echo "\"" >> "${FILE}.tmp"
 else
diff --git a/script/rofi-theme-selector b/script/rofi-theme-selector
index a7431fb9..e0cb8581 100755
--- a/script/rofi-theme-selector
+++ b/script/rofi-theme-selector
@@ -103,7 +103,7 @@ create_config_copy()
 {
     ${ROFI} -dump-config > "${TMP_CONFIG_FILE}"
     # remove theme entry.
-    sed -i 's/^\s*theme:\s\+".*"\s*;//g' "${TMP_CONFIG_FILE}"
+    ${SED} -i 's/^\s*theme:\s\+".*"\s*;//g' "${TMP_CONFIG_FILE}"
 }
 
 ###