diff --git a/src/external/quartic_solver.cpp b/src/external/quartic_solver.cpp
index 17410654fd..0b280e83c2 100644
--- a/src/external/quartic_solver.cpp
+++ b/src/external/quartic_solver.cpp
@@ -2,6 +2,7 @@
 #include <cmath>
 #include <complex>
 #include <cstdlib>
+#include <limits>
 
 namespace oqs {