diff --git a/src/platform.h b/src/platform.h
index 21c459a74..7ddb612ae 100644
--- a/src/platform.h
+++ b/src/platform.h
@@ -3,7 +3,6 @@
 #ifndef UNILIB_H
 #define UNILIB_H
 
-#define _POSIX_C_SOURCE 200809L
 #ifdef _MSC_VER
 #ifndef __STDC__
 #define __STDC__ 1 // equivalent to /Za
@@ -18,6 +17,8 @@
 #pragma warning(disable: 4459) // declaration hides global
 #endif
 
+#define _POSIX_C_SOURCE 200809L
+
 #ifndef MAX_PATH
 # define MAX_PATH 4096
 #endif
diff --git a/src/study.c b/src/study.c
index c6dc3b260..fb87987fa 100644
--- a/src/study.c
+++ b/src/study.c
@@ -54,6 +54,8 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include <util/umlaut.h>
 #include <selist.h>
 
+#include <quicklist.h>
+
 /* libc includes */
 #include <assert.h>
 #include <limits.h>