diff --git a/ixwebsocket/IXSelectInterruptEventFd.cpp b/ixwebsocket/IXSelectInterruptEventFd.cpp
index fbfffa63..74f4833a 100644
--- a/ixwebsocket/IXSelectInterruptEventFd.cpp
+++ b/ixwebsocket/IXSelectInterruptEventFd.cpp
@@ -32,6 +32,7 @@
 #include <string.h> // for strerror
 #include <fcntl.h>
 #include <errno.h>
+#include <assert.h>
 #include <sstream>
 
 namespace ix
diff --git a/ixwebsocket/IXSelectInterruptPipe.cpp b/ixwebsocket/IXSelectInterruptPipe.cpp
index 45df2d49..952248db 100644
--- a/ixwebsocket/IXSelectInterruptPipe.cpp
+++ b/ixwebsocket/IXSelectInterruptPipe.cpp
@@ -14,6 +14,7 @@
 #include <string.h> // for strerror
 #include <fcntl.h>
 #include <errno.h>
+#include <assert.h>
 #include <sstream>
 
 namespace ix