diff --git a/libc/cmake/modules/LLVMLibCTestRules.cmake b/libc/cmake/modules/LLVMLibCTestRules.cmake
--- a/libc/cmake/modules/LLVMLibCTestRules.cmake
+++ b/libc/cmake/modules/LLVMLibCTestRules.cmake
@@ -747,7 +747,7 @@
   if(LIBC_ENABLE_HERMETIC_TESTS AND NOT LIBC_TEST_UNIT_TEST_ONLY)
     add_libc_hermetic_test(${test_name}.__hermetic__ ${LIBC_TEST_UNPARSED_ARGUMENTS})
     get_fq_target_name(${test_name} fq_test_name)
-    if(TARGET ${fq_test_name}.__unit__)
+    if(TARGET ${fq_test_name}.__hermetic__ AND TARGET ${fq_test_name}.__unit__)
       # Tests like the file tests perform file operations on disk file. If we
       # don't chain up the unit test and hermetic test, then those tests will
       # step on each other's files.