diff --git a/lib/isc/tests/file_test.c b/lib/isc/tests/file_test.c
index b252b50580..5caed66b2a 100644
--- a/lib/isc/tests/file_test.c
+++ b/lib/isc/tests/file_test.c
@@ -59,17 +59,21 @@ ATF_TC_BODY(isc_file_sanitize, tc) {
 
 	fd = creat(F(TRUNC_SHA), 0644);
 	ATF_CHECK(fd != -1);
-	result = isc_file_sanitize("testdata/file", NAME, "test", buf, 1024);
-	ATF_CHECK_EQ(result, ISC_R_SUCCESS);
-	ATF_CHECK(strcmp(buf, F(TRUNC_SHA)) == 0);
-	close(fd);
+	if (fd != -1) {
+		result = isc_file_sanitize("testdata/file", NAME, "test", buf, 1024);
+		ATF_CHECK_EQ(result, ISC_R_SUCCESS);
+		ATF_CHECK(strcmp(buf, F(TRUNC_SHA)) == 0);
+		close(fd);
+	}
 
 	fd = creat(F(SHA), 0644);
 	ATF_CHECK(fd != -1);
-	result = isc_file_sanitize("testdata/file", NAME, "test", buf, 1024);
-	ATF_CHECK_EQ(result, ISC_R_SUCCESS);
-	ATF_CHECK(strcmp(buf, F(SHA)) == 0);
-	close(fd);
+	if (fd != -1) {
+		result = isc_file_sanitize("testdata/file", NAME, "test", buf, 1024);
+		ATF_CHECK_EQ(result, ISC_R_SUCCESS);
+		ATF_CHECK(strcmp(buf, F(SHA)) == 0);
+		close(fd);
+	}
 
 	result = isc_file_sanitize("testdata/file", BAD1, "test", buf, 1024);
 	ATF_CHECK_EQ(result, ISC_R_SUCCESS);