diff --git a/Documentation/Doxyfile-common.in b/Documentation/Doxyfile-common.in
index f11ec593d..c0696496c 100644
--- a/Documentation/Doxyfile-common.in
+++ b/Documentation/Doxyfile-common.in
@@ -75,3 +75,5 @@ PREDEFINED             = __DOXYGEN__ \
 			 @PREDEFINED@
 
 HAVE_DOT               = YES
+
+BUILTIN_STL_SUPPORT    = YES
diff --git a/include/libcamera/base/shared_fd.h b/include/libcamera/base/shared_fd.h
index 61fe11c1d..65b1044c7 100644
--- a/include/libcamera/base/shared_fd.h
+++ b/include/libcamera/base/shared_fd.h
@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <functional>
 #include <memory>
 
 namespace libcamera {
@@ -57,3 +58,11 @@ static inline bool operator!=(const SharedFD &lhs, const SharedFD &rhs)
 }
 
 } /* namespace libcamera */
+
+template<>
+struct std::hash<libcamera::SharedFD> : private std::hash<int> {
+	auto operator()(const libcamera::SharedFD &x) const noexcept
+	{
+		return std::hash<int>::operator()(x.get());
+	}
+};