diff --git a/debian/tests/testsuite b/debian/tests/testsuite
index 086d60784..0c2b49846 100755
--- a/debian/tests/testsuite
+++ b/debian/tests/testsuite
@@ -4,8 +4,8 @@ set -ev
 
 SRCDIR="$(pwd)"
 
-cd $ADTTMP
+cd "$ADTTMP"
 
-cmake -DCMake_TEST_EXTERNAL_CMAKE=/usr/bin $SRCDIR
+cmake -DCMake_TEST_EXTERNAL_CMAKE=/usr/bin "$SRCDIR"
 make VERBOSE=1
 CTEST_OUTPUT_ON_FAILURE=1 make test ARGS="-E CTestTestUpload -E BootstrapTest"
diff --git a/debian/tests/testsuite-ninja b/debian/tests/testsuite-ninja
index 902f87406..5b9181db4 100755
--- a/debian/tests/testsuite-ninja
+++ b/debian/tests/testsuite-ninja
@@ -4,8 +4,8 @@ set -ev
 
 SRCDIR="$(pwd)"
 
-cd $ADTTMP
+cd "$ADTTMP"
 
-cmake -DCMake_TEST_EXTERNAL_CMAKE=/usr/bin -GNinja $SRCDIR
+cmake -DCMake_TEST_EXTERNAL_CMAKE=/usr/bin -GNinja "$SRCDIR"
 ninja -v
 CTEST_OUTPUT_ON_FAILURE=1 ctest -E CTestTestUpload -E BootstrapTest