diff --git a/tests/functional/check-reqs.sh b/tests/functional/check-reqs.sh
index 2bcd558fd..4d795391e 100755
--- a/tests/functional/check-reqs.sh
+++ b/tests/functional/check-reqs.sh
@@ -6,13 +6,13 @@ clearStore
 
 RESULT=$TEST_ROOT/result
 
-nix-build -o $RESULT check-reqs.nix -A test1
+nix-build -o "$RESULT" check-reqs.nix -A test1
 
-(! nix-build -o $RESULT check-reqs.nix -A test2)
-(! nix-build -o $RESULT check-reqs.nix -A test3)
-(! nix-build -o $RESULT check-reqs.nix -A test4) 2>&1 | grepQuiet 'check-reqs-dep1'
-(! nix-build -o $RESULT check-reqs.nix -A test4) 2>&1 | grepQuiet 'check-reqs-dep2'
-(! nix-build -o $RESULT check-reqs.nix -A test5)
-(! nix-build -o $RESULT check-reqs.nix -A test6)
+(! nix-build -o "$RESULT" check-reqs.nix -A test2)
+(! nix-build -o "$RESULT" check-reqs.nix -A test3)
+(! nix-build -o "$RESULT" check-reqs.nix -A test4) 2>&1 | grepQuiet 'check-reqs-dep1'
+(! nix-build -o "$RESULT" check-reqs.nix -A test4) 2>&1 | grepQuiet 'check-reqs-dep2'
+(! nix-build -o "$RESULT" check-reqs.nix -A test5)
+(! nix-build -o "$RESULT" check-reqs.nix -A test6)
 
-nix-build -o $RESULT check-reqs.nix -A test7
+nix-build -o "$RESULT" check-reqs.nix -A test7