Index: runtime/src/kmp.h
===================================================================
--- runtime/src/kmp.h
+++ runtime/src/kmp.h
@@ -3268,6 +3268,9 @@
 extern int __kmp_aux_unset_affinity_mask_proc(int proc, void **mask);
 extern int __kmp_aux_get_affinity_mask_proc(int proc, void **mask);
 extern void __kmp_balanced_affinity(int tid, int team_size);
+#if KMP_OS_LINUX
+extern int kmp_set_thread_affinity_mask_initial(void);
+#endif
 #endif /* KMP_AFFINITY_SUPPORTED */
 
 extern void __kmp_cleanup_hierarchy();
Index: runtime/src/z_Linux_util.cpp
===================================================================
--- runtime/src/z_Linux_util.cpp
+++ runtime/src/z_Linux_util.cpp
@@ -1280,6 +1280,12 @@
 
   ++__kmp_fork_count;
 
+#if KMP_AFFINITY_SUPPORTED && KMP_OS_LINUX
+  // reset the affinity in the child to the initial thread
+  // affinity in the parent
+  kmp_set_thread_affinity_mask_initial();
+#endif
+
   __kmp_init_runtime = FALSE;
 #if KMP_USE_MONITOR
   __kmp_init_monitor = 0;