diff --git a/test/_test_main.cpp b/test/_test_main.cpp
index 68211e0..bf2dce4 100644
--- a/test/_test_main.cpp
+++ b/test/_test_main.cpp
@@ -31,6 +31,7 @@
 #else
 #include <sys/wait.h>
 #include <unistd.h>
+#include <signal.h>
 #endif
 
 #if defined(__has_include) && __has_include(<error.h>)
@@ -43,7 +44,7 @@ char argv0[MAX_PATH];
 inline const char *getprogname() {
   return GetModuleFileName(NULL, argv0, sizeof(argv0)) ? argv0 : NULL;
 }
-#elif !defined(__APPLE__)
+#elif !defined(__APPLE__) && !defined(__FreeBSD__)
 // N.B.  getprogname() is an Apple/BSD-ism.
 // program_invocation_name is a GLIBC-ism, but it's also
 //  supported by libmusl.