Fix end-to-end test shell scripts

2 files changed, 2 insertions, 2 deletions

diff --git a/tests/test_deprecated_options b/tests/test_deprecated_options
index 5ff59801..8202a70c 100755
--- a/tests/test_deprecated_options
+++ b/tests/test_deprecated_options
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # if first arg provided, use it, otherwise default to release
-DELTA_BIN=${1:=./target/release/delta}
+DELTA_BIN=${1:-./target/release/delta}
 DELTA="$DELTA_BIN --no-gitconfig"
 
 foreground_color=red
diff --git a/tests/test_raw_output_matches_git_on_full_repo_history b/tests/test_raw_output_matches_git_on_full_repo_history
index 667cbd68..c71631fb 100755
--- a/tests/test_raw_output_matches_git_on_full_repo_history
+++ b/tests/test_raw_output_matches_git_on_full_repo_history
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # if first arg provided, use it, otherwise default to release
-DELTA_BIN=${1:=./target/release/delta}
+DELTA_BIN=${1:-./target/release/delta}
 DELTA="$DELTA_BIN --no-gitconfig --raw --max-line-length 0"
 
 ANSIFILTER="./etc/bin/ansifilter"