diff --git a/src/Services/BitsetService.hpp b/src/Services/BitsetService.hpp
index 0a1890ca..7b6cfd8e 100644
--- a/src/Services/BitsetService.hpp
+++ b/src/Services/BitsetService.hpp
@@ -48,7 +48,9 @@ namespace Services
             auto output = SubjectType{0};
 
             for (const auto& range : ranges) {
-                output = (output << range.length) | BitsetService::extractBitField(subject, range);
+                output = static_cast<SubjectType>(
+                    (output << range.length) | BitsetService::extractBitField(subject, range)
+                );
             }
 
             return output;