diff --git a/src/util/MimeType.cxx b/src/util/MimeType.cxx
index 121b874ee..bf2f9aa1a 100644
--- a/src/util/MimeType.cxx
+++ b/src/util/MimeType.cxx
@@ -23,7 +23,7 @@
 #include <string.h>
 
 std::string
-GetMimeTypeBase(const char *s)
+GetMimeTypeBase(const char *s) noexcept
 {
 	const char *semicolon = strchr(s, ';');
 	return semicolon != nullptr
@@ -32,7 +32,7 @@ GetMimeTypeBase(const char *s)
 }
 
 std::map<std::string, std::string>
-ParseMimeTypeParameters(const char *s)
+ParseMimeTypeParameters(const char *s) noexcept
 {
 	std::map<std::string, std::string> result;
 
diff --git a/src/util/MimeType.hxx b/src/util/MimeType.hxx
index 9ce102dbc..4e41b461c 100644
--- a/src/util/MimeType.hxx
+++ b/src/util/MimeType.hxx
@@ -29,7 +29,7 @@
  * the string as-is.
  */
 std::string
-GetMimeTypeBase(const char *s);
+GetMimeTypeBase(const char *s) noexcept;
 
 /**
  * Parse the parameters from a MIME type string.  Parameters are
@@ -38,6 +38,6 @@ GetMimeTypeBase(const char *s);
  * "foo/bar; param1=value1; param2=value2"
  */
 std::map<std::string, std::string>
-ParseMimeTypeParameters(const char *s);
+ParseMimeTypeParameters(const char *s) noexcept;
 
 #endif