diff --git a/libc/test/src/fenv/enabled_exceptions_test.cpp b/libc/test/src/fenv/enabled_exceptions_test.cpp
--- a/libc/test/src/fenv/enabled_exceptions_test.cpp
+++ b/libc/test/src/fenv/enabled_exceptions_test.cpp
@@ -49,6 +49,17 @@
       ASSERT_EQ(__llvm_libc::fetestexcept(others), others);
     }
 
-    ASSERT_RAISES_FP_EXCEPT([=] { __llvm_libc::feraiseexcept(e); });
+    ASSERT_RAISES_FP_EXCEPT([=] {
+      // In test frameworks like Fuchsia's zxtest, this translates to
+      // a death test which run in a different thread. So, we enable
+      // the exception again so that the exception gets enabled in
+      // the child thread.
+      __llvm_libc::fputil::enableExcept(e);
+      __llvm_libc::feraiseexcept(e);
+    });
+
+    // Cleanup.
+    __llvm_libc::fputil::disableExcept(FE_ALL_EXCEPT);
+    ASSERT_EQ(__llvm_libc::feclearexcept(FE_ALL_EXCEPT), 0);
   }
 }
diff --git a/libc/test/src/fenv/feholdexcept_test.cpp b/libc/test/src/fenv/feholdexcept_test.cpp
--- a/libc/test/src/fenv/feholdexcept_test.cpp
+++ b/libc/test/src/fenv/feholdexcept_test.cpp
@@ -28,9 +28,19 @@
     // should not crash/invoke the exception handler.
     ASSERT_EQ(__llvm_libc::fputil::raiseExcept(e), 0);
 
-    // When we put back the saved env which has the exception enabled, it
-    // should crash with SIGFPE.
-    __llvm_libc::fputil::setEnv(&env);
-    ASSERT_RAISES_FP_EXCEPT([=] { __llvm_libc::fputil::raiseExcept(e); });
+    ASSERT_RAISES_FP_EXCEPT([=] {
+      // When we put back the saved env which has the exception enabled, it
+      // should crash with SIGFPE. Note that we set the old environment
+      // back in this closure because in some test frameworks like Fuchsia's
+      // zxtest, this translates to a death test in which this closure is
+      // run in a different thread. By setting the old environment inside
+      // the closure sets the environment for that different thread as well.
+      __llvm_libc::fputil::setEnv(&env);
+      __llvm_libc::fputil::raiseExcept(e);
+    });
+
+    // Cleanup
+    __llvm_libc::fputil::disableExcept(FE_ALL_EXCEPT);
+    ASSERT_EQ(__llvm_libc::fputil::clearExcept(FE_ALL_EXCEPT), 0);
   }
 }