diff --git a/support/support_ptrace.c b/support/support_ptrace.c
index 616b08c..a733adf 100644
--- a/support/support_ptrace.c
+++ b/support/support_ptrace.c
@@ -19,7 +19,6 @@
 #include <support/check.h>
 #include <support/xstdio.h>
 #include <support/xptrace.h>
-#include <sys/prctl.h>
 
 int
 support_ptrace_scope (void)