diff --git a/lib/system/threadlocalstorage.nim b/lib/system/threadlocalstorage.nim
index 922150fff7..cbb74c7df2 100644
--- a/lib/system/threadlocalstorage.nim
+++ b/lib/system/threadlocalstorage.nim
@@ -194,8 +194,23 @@ else:
   proc cpusetIncl(cpu: cint; s: var CpuSet) {.
     importc: "CPU_SET", header: schedh.}
 
-  proc setAffinity(thread: SysThread; setsize: csize_t; s: var CpuSet) {.
-    importc: "pthread_setaffinity_np", header: pthreadh.}
+  when defined(android):
+    # libc of android doesn't implement pthread_setaffinity_np,
+    # it exposes pthread_gettid_np though, so we can use that in combination
+    # with sched_setaffinity to set the thread affinity.
+    type Pid {.importc: "pid_t", header: "<sys/types.h>".} = int32 # From posix_other.nim
+
+    proc setAffinityTID(tid: Pid; setsize: csize_t; s: var CpuSet) {.
+      importc: "sched_setaffinity", header: schedh.}
+
+    proc pthread_gettid_np(thread: SysThread): Pid {.
+      importc: "pthread_gettid_np", header: pthreadh.}
+
+    proc setAffinity(thread: SysThread; setsize: csize_t; s: var CpuSet) =
+      setAffinityTID(pthread_gettid_np(thread), setsize, s)
+  else:
+    proc setAffinity(thread: SysThread; setsize: csize_t; s: var CpuSet) {.
+      importc: "pthread_setaffinity_np", header: pthreadh.}
 
 
 const