diff --git a/schroedinger/schroasync-win32.c b/schroedinger/schroasync-win32.c
index a8493db..a6ab180 100644
--- a/schroedinger/schroasync-win32.c
+++ b/schroedinger/schroasync-win32.c
@@ -11,6 +11,7 @@
 #include <time.h>
 
 #include <windows.h>
+#include <process.h>
 
 #define COND_LIST_SIZE 10
 #define STACK_SIZE 65536
