diff --git a/src/backend/backend.c b/src/backend/backend.c
index 3593919..bded608 100644
--- a/src/backend/backend.c
+++ b/src/backend/backend.c
@@ -215,6 +215,7 @@ void paint_all_new(session_t *ps, struct managed_win *t, bool ignore_damage) {
 				blur_opacity =
 				    w->opacity / win_calc_opacity_target(ps, w, true);
 			}
+			assert(blur_opacity >= 0 && blur_opacity <= 1);
 
 			if (real_win_mode == WMODE_TRANS || ps->o.force_win_blend) {
 				// We need to blur the bounding shape of the window
diff --git a/src/event.c b/src/event.c
index 89c06ef..f636703 100644
--- a/src/event.c
+++ b/src/event.c
@@ -11,10 +11,10 @@
 #include "atom.h"
 #include "common.h"
 #include "compiler.h"
-#include "picom.h"
 #include "config.h"
 #include "event.h"
 #include "log.h"
+#include "picom.h"
 #include "region.h"
 #include "utils.h"
 #include "win.h"