diff --git a/language/duchain/duchainutils.cpp b/language/duchain/duchainutils.cpp
--- a/language/duchain/duchainutils.cpp
+++ b/language/duchain/duchainutils.cpp
@@ -477,8 +477,7 @@
   return ret;
 }
 
-///For a class, returns all classes that inherit it
-QList<Declaration*> DUChainUtils::getInheriters(const Declaration* decl, uint& maxAllowedSteps, bool collectVersions)
+static QList<Declaration*> getInheritersInternal(const Declaration* decl, uint& maxAllowedSteps, bool collectVersions)
 {
   QList<Declaration*> ret;
 
@@ -516,7 +515,7 @@
       ++maxAllowedSteps;
 
       if(allDeclarations[a].data() && allDeclarations[a].data() != decl) {
-        ret += getInheriters(allDeclarations[a].data(), maxAllowedSteps, false);
+        ret += getInheritersInternal(allDeclarations[a].data(), maxAllowedSteps, false);
       }
 
       if(maxAllowedSteps == 0)
@@ -527,6 +526,17 @@
   return ret;
 }
 
+QList<Declaration*> DUChainUtils::getInheriters(const Declaration* decl, uint& maxAllowedSteps, bool collectVersions)
+{
+  auto inheriters = getInheritersInternal(decl, maxAllowedSteps, collectVersions);
+
+  // remove duplicates
+  std::sort(inheriters.begin(), inheriters.end());
+  inheriters.erase(std::unique(inheriters.begin(), inheriters.end()), inheriters.end());
+
+  return inheriters;
+}
+
 QList<Declaration*> DUChainUtils::getOverriders(const Declaration* currentClass, const Declaration* overriddenDeclaration, uint& maxAllowedSteps) {
   QList<Declaration*> ret;