diff --git a/src/output/plugins/sles/SlesOutputPlugin.cxx b/src/output/plugins/sles/SlesOutputPlugin.cxx
index 61a815554..6c3978a9d 100644
--- a/src/output/plugins/sles/SlesOutputPlugin.cxx
+++ b/src/output/plugins/sles/SlesOutputPlugin.cxx
@@ -33,6 +33,7 @@
 #include <SLES/OpenSLES.h>
 #include <SLES/OpenSLES_Android.h>
 
+#include <cassert>
 #include <iterator>
 #include <stdexcept>