diff --git a/tests/signal_test.cpp b/tests/signal_test.cpp
index 5bda8b3..7f7f3db 100644
--- a/tests/signal_test.cpp
+++ b/tests/signal_test.cpp
@@ -34,6 +34,13 @@
 
 using namespace std::chrono_literals;
 
+#if defined(ANDROID_HOST_MUSL)
+// Musl doesn't export __SIGRTMIN and __SIGRTMAX, #define
+// them here.
+#define __SIGRTMIN 32
+#define __SIGRTMAX 64
+#endif
+
 static int SIGNAL_MIN() {
   return 1; // Signals start at 1 (SIGHUP), not 0.
 }