diff --git a/src/libs/clangsupport/refactoringdatabaseinitializer.h b/src/libs/clangsupport/refactoringdatabaseinitializer.h
index 4a5ebda798c..99e4afde8a4 100644
--- a/src/libs/clangsupport/refactoringdatabaseinitializer.h
+++ b/src/libs/clangsupport/refactoringdatabaseinitializer.h
@@ -77,7 +77,7 @@ public:
         const Sqlite::Column &lineColumn = table.addColumn("line", Sqlite::ColumnType::Integer);
         const Sqlite::Column &columnColumn = table.addColumn("column", Sqlite::ColumnType::Integer);
         const Sqlite::Column &sourceIdColumn = table.addColumn("sourceId", Sqlite::ColumnType::Integer);
-        table.addIndex({sourceIdColumn, lineColumn, columnColumn});
+        table.addUniqueIndex({sourceIdColumn, lineColumn, columnColumn});
 
         table.initialize(database);
     }
@@ -91,7 +91,7 @@ public:
         const Sqlite::Column &directoryIdColumn = table.addColumn("directoryId", Sqlite::ColumnType::Integer);
         const Sqlite::Column &sourceNameColumn = table.addColumn("sourceName", Sqlite::ColumnType::Text);
         table.addColumn("sourceType", Sqlite::ColumnType::Integer);
-        table.addIndex({directoryIdColumn, sourceNameColumn});
+        table.addUniqueIndex({directoryIdColumn, sourceNameColumn});
 
         table.initialize(database);
     }
@@ -103,7 +103,7 @@ public:
         table.setName("directories");
         table.addColumn("directoryId", Sqlite::ColumnType::Integer, Sqlite::Contraint::PrimaryKey);
         const Sqlite::Column &directoryPathColumn = table.addColumn("directoryPath", Sqlite::ColumnType::Text);
-        table.addIndex({directoryPathColumn});
+        table.addUniqueIndex({directoryPathColumn});
 
         table.initialize(database);
     }
@@ -118,7 +118,7 @@ public:
         table.addColumn("compilerArguments", Sqlite::ColumnType::Text);
         table.addColumn("compilerMacros", Sqlite::ColumnType::Text);
         table.addColumn("includeSearchPaths", Sqlite::ColumnType::Text);
-        table.addIndex({projectPartNameColumn});
+        table.addUniqueIndex({projectPartNameColumn});
 
         table.initialize(database);
     }
diff --git a/tests/unit/unittest/refactoringdatabaseinitializer-test.cpp b/tests/unit/unittest/refactoringdatabaseinitializer-test.cpp
index aa48e790946..a64b755b048 100644
--- a/tests/unit/unittest/refactoringdatabaseinitializer-test.cpp
+++ b/tests/unit/unittest/refactoringdatabaseinitializer-test.cpp
@@ -57,7 +57,7 @@ TEST_F(RefactoringDatabaseInitializer, AddLocationsTable)
     InSequence s;
 
     EXPECT_CALL(mockDatabase, execute(Eq("CREATE TABLE IF NOT EXISTS locations(symbolId INTEGER, line INTEGER, column INTEGER, sourceId INTEGER)")));
-    EXPECT_CALL(mockDatabase, execute(Eq("CREATE INDEX IF NOT EXISTS index_locations_sourceId_line_column ON locations(sourceId, line, column)")));
+    EXPECT_CALL(mockDatabase, execute(Eq("CREATE UNIQUE INDEX IF NOT EXISTS index_locations_sourceId_line_column ON locations(sourceId, line, column)")));
 
     initializer.createLocationsTable();
 }
@@ -67,7 +67,7 @@ TEST_F(RefactoringDatabaseInitializer, AddSourcesTable)
     InSequence s;
 
     EXPECT_CALL(mockDatabase, execute(Eq("CREATE TABLE IF NOT EXISTS sources(sourceId INTEGER PRIMARY KEY, directoryId INTEGER, sourceName TEXT, sourceType INTEGER)")));
-    EXPECT_CALL(mockDatabase, execute(Eq("CREATE INDEX IF NOT EXISTS index_sources_directoryId_sourceName ON sources(directoryId, sourceName)")));
+    EXPECT_CALL(mockDatabase, execute(Eq("CREATE UNIQUE INDEX IF NOT EXISTS index_sources_directoryId_sourceName ON sources(directoryId, sourceName)")));
 
     initializer.createSourcesTable();
 }
@@ -77,7 +77,7 @@ TEST_F(RefactoringDatabaseInitializer, AddDirectoriesTable)
     InSequence s;
 
     EXPECT_CALL(mockDatabase, execute(Eq("CREATE TABLE IF NOT EXISTS directories(directoryId INTEGER PRIMARY KEY, directoryPath TEXT)")));
-    EXPECT_CALL(mockDatabase, execute(Eq("CREATE INDEX IF NOT EXISTS index_directories_directoryPath ON directories(directoryPath)")));
+    EXPECT_CALL(mockDatabase, execute(Eq("CREATE UNIQUE INDEX IF NOT EXISTS index_directories_directoryPath ON directories(directoryPath)")));
 
     initializer.createDirectoriesTable();
 }
@@ -87,7 +87,7 @@ TEST_F(RefactoringDatabaseInitializer, AddProjectPartsTable)
     InSequence s;
 
     EXPECT_CALL(mockDatabase, execute(Eq("CREATE TABLE IF NOT EXISTS projectParts(projectPartId INTEGER PRIMARY KEY, projectPartName TEXT, compilerArguments TEXT, compilerMacros TEXT, includeSearchPaths TEXT)")));
-    EXPECT_CALL(mockDatabase, execute(Eq("CREATE INDEX IF NOT EXISTS index_projectParts_projectPartName ON projectParts(projectPartName)")));
+    EXPECT_CALL(mockDatabase, execute(Eq("CREATE UNIQUE INDEX IF NOT EXISTS index_projectParts_projectPartName ON projectParts(projectPartName)")));
 
     initializer.createProjectPartsTable();
 }
@@ -150,13 +150,13 @@ TEST_F(RefactoringDatabaseInitializer, CreateInTheContructor)
     EXPECT_CALL(mockDatabase, execute(Eq("CREATE TABLE IF NOT EXISTS symbols(symbolId INTEGER PRIMARY KEY, usr TEXT, symbolName TEXT)")));
     EXPECT_CALL(mockDatabase, execute(Eq("CREATE INDEX IF NOT EXISTS index_symbols_usr ON symbols(usr)")));
     EXPECT_CALL(mockDatabase, execute(Eq("CREATE TABLE IF NOT EXISTS locations(symbolId INTEGER, line INTEGER, column INTEGER, sourceId INTEGER)")));
-    EXPECT_CALL(mockDatabase, execute(Eq("CREATE INDEX IF NOT EXISTS index_locations_sourceId_line_column ON locations(sourceId, line, column)")));
+    EXPECT_CALL(mockDatabase, execute(Eq("CREATE UNIQUE INDEX IF NOT EXISTS index_locations_sourceId_line_column ON locations(sourceId, line, column)")));
     EXPECT_CALL(mockDatabase, execute(Eq("CREATE TABLE IF NOT EXISTS sources(sourceId INTEGER PRIMARY KEY, directoryId INTEGER, sourceName TEXT, sourceType INTEGER)")));
-    EXPECT_CALL(mockDatabase, execute(Eq("CREATE INDEX IF NOT EXISTS index_sources_directoryId_sourceName ON sources(directoryId, sourceName)")));
+    EXPECT_CALL(mockDatabase, execute(Eq("CREATE UNIQUE INDEX IF NOT EXISTS index_sources_directoryId_sourceName ON sources(directoryId, sourceName)")));
     EXPECT_CALL(mockDatabase, execute(Eq("CREATE TABLE IF NOT EXISTS directories(directoryId INTEGER PRIMARY KEY, directoryPath TEXT)")));
-    EXPECT_CALL(mockDatabase, execute(Eq("CREATE INDEX IF NOT EXISTS index_directories_directoryPath ON directories(directoryPath)")));
+    EXPECT_CALL(mockDatabase, execute(Eq("CREATE UNIQUE INDEX IF NOT EXISTS index_directories_directoryPath ON directories(directoryPath)")));
     EXPECT_CALL(mockDatabase, execute(Eq("CREATE TABLE IF NOT EXISTS projectParts(projectPartId INTEGER PRIMARY KEY, projectPartName TEXT, compilerArguments TEXT, compilerMacros TEXT, includeSearchPaths TEXT)")));
-    EXPECT_CALL(mockDatabase, execute(Eq("CREATE INDEX IF NOT EXISTS index_projectParts_projectPartName ON projectParts(projectPartName)")));
+    EXPECT_CALL(mockDatabase, execute(Eq("CREATE UNIQUE INDEX IF NOT EXISTS index_projectParts_projectPartName ON projectParts(projectPartName)")));
     EXPECT_CALL(mockDatabase, execute(Eq("CREATE TABLE IF NOT EXISTS projectPartsSources(projectPartId INTEGER, sourceId INTEGER)")));
     EXPECT_CALL(mockDatabase, execute(Eq("CREATE UNIQUE INDEX IF NOT EXISTS index_projectPartsSources_sourceId_projectPartId ON projectPartsSources(sourceId, projectPartId)")));
     EXPECT_CALL(mockDatabase, execute(Eq("CREATE INDEX IF NOT EXISTS index_projectPartsSources_projectPartId ON projectPartsSources(projectPartId)")));