diff --git a/scripts/cleanup.sh b/scripts/cleanup.sh
index 56976af..b9d88a5 100755
--- a/scripts/cleanup.sh
+++ b/scripts/cleanup.sh
@@ -3,7 +3,7 @@ set -e
 export LC_ALL=C
 export DEBIAN_FRONTEND=noninteractive
 
-if [ "${DEBUG}" == true ]; then
+if [ "${DEBUG}" = true ]; then
   set -x
 fi
 
diff --git a/scripts/install.sh b/scripts/install.sh
index 9dc9822..0008125 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -3,7 +3,7 @@ set -e
 export LC_ALL=C
 export DEBIAN_FRONTEND=noninteractive
 
-if [ "${DEBUG}" == true ]; then
+if [ "${DEBUG}" = true ]; then
   set -x
 fi
 
diff --git a/services/postgresql-startup.sh b/services/postgresql-startup.sh
index 07294d5..cd8e089 100644
--- a/services/postgresql-startup.sh
+++ b/services/postgresql-startup.sh
@@ -2,7 +2,7 @@
 
 set -e
 
-if [ "${DEBUG}" == true ]; then
+if [ "${DEBUG}" = true ]; then
   set -x
 fi
 
diff --git a/services/postgresql/postgresql.sh b/services/postgresql/postgresql.sh
index 57020bd..f34994f 100755
--- a/services/postgresql/postgresql.sh
+++ b/services/postgresql/postgresql.sh
@@ -3,7 +3,7 @@ set -e
 export LC_ALL=C
 export DEBIAN_FRONTEND=noninteractive
 
-if [ "${DEBUG}" == true ]; then
+if [ "${DEBUG}" = true ]; then
   set -x
 fi