diff --git a/Processes/Sibyll/Decay.h b/Processes/Sibyll/Decay.h
index 76d61f7b5a44928a4a43d6d97aac7cfd231514eb..7e7a202e7c3172577c6a5662d09eb67bbb9433f2 100644
--- a/Processes/Sibyll/Decay.h
+++ b/Processes/Sibyll/Decay.h
@@ -15,6 +15,8 @@
 #include <corsika/particles/ParticleProperties.h>
 #include <corsika/process/DecayProcess.h>
 
+#include <vector>
+
 namespace corsika::process {
 
   namespace sibyll {