diff --git a/src/coreclr/pal/src/thread/thread.cpp b/src/coreclr/pal/src/thread/thread.cpp
index 7e9c3baa6a0cd1..f7174e69ba5be0 100644
--- a/src/coreclr/pal/src/thread/thread.cpp
+++ b/src/coreclr/pal/src/thread/thread.cpp
@@ -1423,7 +1423,7 @@ CPalThread::ThreadEntry(
                     // vendor-modified Android kernels with strict SELinux policy) block
                     // sched_setaffinity even when passed a mask extracted via sched_getaffinity.
                     // Treat this as non-fatal — the thread will continue running on any
-                    // available CPU rather than the originally affinitized one. 
+                    // available CPU rather than the originally affinitized one.
                     WARN("sched_setaffinity failed with EPERM/EACCES, ignoring\n");
                 }
                 else
@@ -2316,6 +2316,12 @@ CPalThread::GetStackBase()
 #ifdef TARGET_APPLE
     // This is a Mac specific method
     stackBase = pthread_get_stackaddr_np(pthread_self());
+#elif defined(TARGET_OPENBSD)
+    stack_t stack;
+    int status = pthread_stackseg_np(pthread_self(), &stack);
+    _ASSERT_MSG(status == 0, "pthread_stackseg_np call failed");
+
+    stackBase = stack.ss_sp;
 #else
     pthread_attr_t attr;
     void* stackAddr;
@@ -2361,6 +2367,12 @@ CPalThread::GetStackLimit()
     // This is a Mac specific method
     stackLimit = ((BYTE *)pthread_get_stackaddr_np(pthread_self()) -
                    pthread_get_stacksize_np(pthread_self()));
+#elif defined(TARGET_OPENBSD)
+    stack_t stack;
+    int status = pthread_stackseg_np(pthread_self(), &stack);
+    _ASSERT_MSG(status == 0, "pthread_stackseg_np call failed");
+
+    stackLimit = (void*)stack.ss_size;
 #else
     pthread_attr_t attr;
     size_t stackSize;