diff --git a/scripts/common_cmdline.sh b/scripts/common_cmdline.sh
index 5263b6121..2637fdedb 100644
--- a/scripts/common_cmdline.sh
+++ b/scripts/common_cmdline.sh
@@ -51,12 +51,12 @@ function compileFull()
 
     local files=("$@")
 
-    local stderr_path=$(mktemp)
+    local stderr_path; stderr_path=$(mktemp)
 
     set +e
     "$SOLC" "${args[@]}" "${files[@]}" >/dev/null 2>"$stderr_path"
     local exit_code=$?
-    local errors=$(grep -v -E 'Warning: This is a pre-release compiler version|Warning: Experimental features are turned on|pragma experimental ABIEncoderV2|^ +--> |^ +\||^[0-9]+ +\|' < "$stderr_path")
+    local errors; errors=$(grep -v -E 'Warning: This is a pre-release compiler version|Warning: Experimental features are turned on|pragma experimental ABIEncoderV2|^ +--> |^ +\||^[0-9]+ +\|' < "$stderr_path")
     set -e
     rm "$stderr_path"
 
diff --git a/scripts/wasm-rebuild/docker-scripts/rebuild_tags.sh b/scripts/wasm-rebuild/docker-scripts/rebuild_tags.sh
index 3475057e4..05ada07f3 100755
--- a/scripts/wasm-rebuild/docker-scripts/rebuild_tags.sh
+++ b/scripts/wasm-rebuild/docker-scripts/rebuild_tags.sh
@@ -86,7 +86,7 @@ function process_tag() {
   local TAG=$1
   cd /src
   # Checkout the historic commit instead of the tag directly.
-  local HISTORIC_COMMIT_HASH="$(grep "${TAG}+" /tmp/release_commit_list.txt | cut -d '+' -f 2 | cut -d '.' -f 2)"
+  local HISTORIC_COMMIT_HASH; HISTORIC_COMMIT_HASH="$(grep "${TAG}+" /tmp/release_commit_list.txt | cut -d '+' -f 2 | cut -d '.' -f 2)"
   if [ "$(git cat-file -t "${HISTORIC_COMMIT_HASH}" 2>/dev/null)" == "commit" ]; then
     clean_git_checkout "$HISTORIC_COMMIT_HASH"
   else
@@ -103,7 +103,7 @@ function process_tag() {
     VERSION=$(echo "$TAG" | cut -d v -f 2)
   fi
 
-  local COMMIT_HASH=$(git rev-parse --short=8 HEAD)
+  local COMMIT_HASH; COMMIT_HASH=$(git rev-parse --short=8 HEAD)
   local FULL_VERSION_SUFFIX="${TAG}+commit.${COMMIT_HASH}"
   local HISTORIC_VERSION_SUFFIX="${TAG}+commit.${HISTORIC_COMMIT_HASH}"
 
diff --git a/test/cmdlineTests.sh b/test/cmdlineTests.sh
index b86561f71..16b5b5df6 100755
--- a/test/cmdlineTests.sh
+++ b/test/cmdlineTests.sh
@@ -121,8 +121,8 @@ function test_solc_behaviour()
     local stderr_expected="${7}"
     local stdout_expectation_file="${8}" # the file to write to when user chooses to update stdout expectation
     local stderr_expectation_file="${9}" # the file to write to when user chooses to update stderr expectation
-    local stdout_path=$(mktemp)
-    local stderr_path=$(mktemp)
+    local stdout_path; stdout_path=$(mktemp)
+    local stderr_path; stderr_path=$(mktemp)
 
     trap "rm -f $stdout_path $stderr_path" EXIT