diff --git a/rtengine/dcp.cc b/rtengine/dcp.cc
index 89256bba4..b65bb5f72 100644
--- a/rtengine/dcp.cc
+++ b/rtengine/dcp.cc
@@ -1768,7 +1768,7 @@ inline void DCPProfile::hsdApply(const HsdTableInfo& table_info, const std::vect
     }
 }
 
-bool DCPProfile::isValid()
+bool DCPProfile::isValid() const
 {
     return valid;
 }
@@ -1850,7 +1850,7 @@ void DCPStore::init(const Glib::ustring& rt_profile_dir, bool loadAll)
     }
 }
 
-bool DCPStore::isValidDCPFileName(const Glib::ustring& filename) const
+bool DCPStore::isValidDCPFileName(const Glib::ustring& filename)
 {
     if (!Glib::file_test(filename, Glib::FILE_TEST_EXISTS) || Glib::file_test(filename, Glib::FILE_TEST_IS_DIR)) {
         return false;
diff --git a/rtengine/dcp.h b/rtengine/dcp.h
index 573349348..2aec6da12 100644
--- a/rtengine/dcp.h
+++ b/rtengine/dcp.h
@@ -63,7 +63,7 @@ public:
     bool getHasBaselineExposureOffset() const;
 
     Illuminants getIlluminants() const;
-    bool isValid();
+    bool isValid() const;
 
     void apply(
         Imagefloat* img,
@@ -159,7 +159,7 @@ public:
 
     void init(const Glib::ustring& rt_profile_dir, bool loadAll = true);
 
-    bool isValidDCPFileName(const Glib::ustring& filename) const;
+    static bool isValidDCPFileName(const Glib::ustring& filename);
 
     DCPProfile* getProfile(const Glib::ustring& filename) const;
     DCPProfile* getStdProfile(const Glib::ustring& camShortName) const;