diff --git a/src/rgbcx/BC4/BC4Encoder.h b/src/rgbcx/BC4/BC4Encoder.h
index eb5b73b..4bda401 100644
--- a/src/rgbcx/BC4/BC4Encoder.h
+++ b/src/rgbcx/BC4/BC4Encoder.h
@@ -21,6 +21,7 @@
 
 #include <cassert>
 #include <cstdint>
+#include <stdexcept>
 
 #include "../BlockEncoder.h"
 #include "../BlockView.h"