diff --git a/compiler-rt/test/sanitizer_common/TestCases/Posix/posix_spawn.c b/compiler-rt/test/sanitizer_common/TestCases/Posix/posix_spawn.c
index ea58b92af6097..1a66a6166dd1d 100644
--- a/compiler-rt/test/sanitizer_common/TestCases/Posix/posix_spawn.c
+++ b/compiler-rt/test/sanitizer_common/TestCases/Posix/posix_spawn.c
@@ -6,8 +6,12 @@
 #include <assert.h>
 #include <spawn.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <sys/wait.h>
 
+extern char **environ;
+
 int main(int argc, char **argv) {
   if (argc > 1) {
     // CHECK: SPAWNED
@@ -23,11 +27,22 @@ int main(int argc, char **argv) {
       argv[0], "2", "3", "4", "2", "3", "4", "2", "3", "4",
       "2",     "3", "4", "2", "3", "4", "2", "3", "4", NULL,
   };
-  char *const env[] = {
+  char *env[] = {
       "A=B", "A=B", "A=B", "A=B", "A=B", "A=B", "A=B", "A=B", "A=B", "A=B",
       "A=B", "A=B", "A=B", "A=B", "A=B", "A=B", "A=B", "A=B", "A=B", NULL,
   };
 
+  // When this test runs with a runtime (e.g. ASAN), the spawned process needs
+  // to use the same runtime search path as the parent. Otherwise, it might
+  // try to load a runtime that doesn't work and crash before hitting main(),
+  // failing the test. We technically should forward the variable for the
+  // current platform, but some platforms have multiple such variables and
+  // it's quite difficult to plumb this through the lit config.
+  for (char **e = environ; *e; e++)
+    if (strncmp(*e, "DYLD_LIBRARY_PATH=", sizeof("DYLD_LIBRARY_PATH=") - 1) ==
+        0)
+      env[0] = *e;
+
   pid_t pid;
   int s = posix_spawn(&pid, argv[0], &file_actions, &attr, args, env);
   assert(!s);