diff --git a/ci/test_integrationtests.sh b/ci/test_integrationtests.sh
index ce95c09098..cce3b52aa5 100755
--- a/ci/test_integrationtests.sh
+++ b/ci/test_integrationtests.sh
@@ -21,7 +21,7 @@ cd build-ci/dashcore-$BUILD_TARGET
 
 if [ "$SOCKETEVENTS" = "" ]; then
   # Let's switch socketevents mode to some random mode
-  R=$(($RANDOM%3))
+  R=$((RANDOM%3))
   if [ "$R" == "0" ]; then
     SOCKETEVENTS="select"
   elif [ "$R" == "1" ]; then
diff --git a/contrib/gitian-descriptors/gitian-linux.yml b/contrib/gitian-descriptors/gitian-linux.yml
index ea4c95f1e9..b9817d2a3a 100755
--- a/contrib/gitian-descriptors/gitian-linux.yml
+++ b/contrib/gitian-descriptors/gitian-linux.yml
@@ -79,7 +79,7 @@ script: |
   fi
 
   # We include the GCC version in all wrappers so that ccache can detect compiler upgrades when hashing the wrappers
-  GCCVERSION=`gcc --version | head -1`
+  GCCVERSION=$(gcc --version | head -1)
 
   # Use $LIB in LD_PRELOAD to avoid hardcoding the dir (See `man ld.so`)
   function create_global_faketime_wrappers {
diff --git a/contrib/gitian-descriptors/gitian-win.yml b/contrib/gitian-descriptors/gitian-win.yml
index ed38b4a6ac..8c17304aee 100755
--- a/contrib/gitian-descriptors/gitian-win.yml
+++ b/contrib/gitian-descriptors/gitian-win.yml
@@ -67,7 +67,7 @@ script: |
   fi
 
   # We include the GCC version in all wrappers so that ccache can detect compiler upgrades when hashing the wrappers
-  GCCVERSION=`gcc --version | head -1`
+  GCCVERSION=$(gcc --version | head -1)
 
   # Use $LIB in LD_PRELOAD to avoid hardcoding the dir (See `man ld.so`)
   function create_global_faketime_wrappers {
@@ -107,7 +107,7 @@ script: |
         echo "# GCCVERSION=${GCCVERSION}" >> ${WRAP_DIR}/${i}-${prog}
         echo "REAL=\`which -a ${i}-${prog}-posix | grep -v ${WRAP_DIR}/${i}-${prog} | head -1\`" >> ${WRAP_DIR}/${i}-${prog}
         echo '# Add the gcc version to the wrapper so that ccache takes this into account (we use CCACHE_COMPILERCHECK=content)' >> ${WRAP_DIR}/${i}-${prog}
-        echo "# `${prog} --version | head -1`" >> ${WRAP_DIR}/${i}-${prog}
+        echo "# $(${prog} --version | head -1)" >> ${WRAP_DIR}/${i}-${prog}
         echo "export LD_PRELOAD='/usr/\$LIB/faketime/libfaketime.so.1'" >> ${WRAP_DIR}/${i}-${prog}
         echo "export FAKETIME=\"$1\"" >> ${WRAP_DIR}/${i}-${prog}
         echo "export COMPILER_PATH=${WRAP_DIR}/${i}" >> ${WRAP_DIR}/${i}-${prog}