diff --git a/meson.build b/meson.build
index 5136b21..6985bb1 100644
--- a/meson.build
+++ b/meson.build
@@ -16,7 +16,7 @@ check_functions = [
 ]
 
 foreach f : check_functions
-  if cc.has_function(f.get(1), prefix : '#include <' + f.get(2) + '>') and cc.has_header_symbol(f.get(2), f.get(1))
+  if cc.has_function(f.get(1), prefix : '#define _BSD_SOURCE\n#include <' + f.get(2) + '>') and cc.has_header_symbol(f.get(2), f.get(1), prefix : '#define _BSD_SOURCE')
     cdata.set(f.get(0), 1)
   endif
 endforeach