diff --git a/src/lib/upnp/Action.hxx b/src/lib/upnp/Action.hxx
index 49ed75198..d2c2c01c9 100644
--- a/src/lib/upnp/Action.hxx
+++ b/src/lib/upnp/Action.hxx
@@ -24,14 +24,14 @@
 
 #include <upnptools.h>
 
-static inline constexpr unsigned
+static constexpr unsigned
 CountNameValuePairs() noexcept
 {
 	return 0;
 }
 
 template<typename... Args>
-static inline constexpr unsigned
+static constexpr unsigned
 CountNameValuePairs(gcc_unused const char *name, gcc_unused const char *value,
 		    Args... args) noexcept
 {