diff --git a/sysid/src/main/native/cpp/analysis/OLS.cpp b/sysid/src/main/native/cpp/analysis/OLS.cpp
index d095a485d50..f9cb0f82bf5 100644
--- a/sysid/src/main/native/cpp/analysis/OLS.cpp
+++ b/sysid/src/main/native/cpp/analysis/OLS.cpp
@@ -4,6 +4,7 @@
 
 #include "sysid/analysis/OLS.h"
 
+#include <cassert>
 #include <tuple>
 #include <vector>