diff --git a/src/gtk/filters.cpp b/src/gtk/filters.cpp
index ec3fc59a..2db2b439 100644
--- a/src/gtk/filters.cpp
+++ b/src/gtk/filters.cpp
@@ -87,7 +87,7 @@ Filter pvGetFilter(EFilter _eFilter, EFilterDepth _eDepth)
   return astFilters[_eFilter].m_apvFunc[_eDepth];
 }
 
-char* pcsGetFilterName(const EFilter _eFilter)
+const char* pcsGetFilterName(const EFilter _eFilter)
 {
         return gettext(astFilters[_eFilter].m_csName);
 }
@@ -97,7 +97,7 @@ FilterIB pvGetFilterIB(EFilterIB _eFilterIB, EFilterDepth _eDepth)
   return astFiltersIB[_eFilterIB].m_apvFunc[_eDepth];
 }
 
-char* pcsGetFilterIBName(const EFilterIB _eFilterIB)
+const char* pcsGetFilterIBName(const EFilterIB _eFilterIB)
 {
         return gettext(astFiltersIB[_eFilterIB].m_csName);
 }
diff --git a/src/gtk/filters.h b/src/gtk/filters.h
index 30ded2c9..90f495db 100644
--- a/src/gtk/filters.h
+++ b/src/gtk/filters.h
@@ -64,10 +64,10 @@ enum EFilterDepth
 };
 
 Filter pvGetFilter(EFilter _eFilter, EFilterDepth _eDepth);
-char* pcsGetFilterName(const EFilter _eFilter);
+const char* pcsGetFilterName(const EFilter _eFilter);
 
 FilterIB pvGetFilterIB(EFilterIB _eFilterIB, EFilterDepth _eDepth);
-char* pcsGetFilterIBName(const EFilterIB _eFilterIB);
+const char* pcsGetFilterIBName(const EFilterIB _eFilterIB);
 
 } // namespace VBA