diff --git a/src/study.c b/src/study.c
index fb87987fa..c6dc3b260 100644
--- a/src/study.c
+++ b/src/study.c
@@ -54,8 +54,6 @@ 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>