diff --git a/src/tests/interpol-test.c b/src/tests/interpol-test.c
index 2df65a455..3ec8a18f7 100644
--- a/src/tests/interpol-test.c
+++ b/src/tests/interpol-test.c
@@ -37,6 +37,10 @@
 #include <pthread.h>
 #endif
 
+#ifdef HAVE_WINDOWS_H
+#include <windows.h>
+#endif
+
 #include <pulse/pulseaudio.h>
 #include <pulse/mainloop.h>