diff --git a/src/Base/BaseClass.h b/src/Base/BaseClass.h
index a058ca600e..3de71239de 100644
--- a/src/Base/BaseClass.h
+++ b/src/Base/BaseClass.h
@@ -46,7 +46,7 @@ private:
 #define TYPESYSTEM_HEADER_WITH_OVERRIDE()                                                          \
 public:                                                                                            \
     static Base::Type getClassTypeId(void);                                                        \
-    virtual Base::Type getTypeId(void) const override;                                             \
+    Base::Type getTypeId(void) const override;                                                     \
     static void init(void);                                                                        \
     static void* create(void);                                                                     \
                                                                                                    \
diff --git a/src/Base/Builder3D.h b/src/Base/Builder3D.h
index 4563e2f1f9..d23ca95241 100644
--- a/src/Base/Builder3D.h
+++ b/src/Base/Builder3D.h
@@ -466,7 +466,7 @@ private:
 class BaseExport Coordinate3Item: public NodeItem
 {
 public:
-    Coordinate3Item(const std::vector<Vector3f>& points);
+    explicit Coordinate3Item(const std::vector<Vector3f>& points);
     void write(InventorOutput& out) const override;
 
 private:
@@ -499,7 +499,7 @@ public:
 class BaseExport FaceSetItem: public NodeItem
 {
 public:
-    FaceSetItem(const std::vector<int>&);
+    explicit FaceSetItem(const std::vector<int>&);
     void write(InventorOutput& out) const override;
 
 private:
@@ -512,7 +512,7 @@ private:
 class BaseExport IndexedLineSetItem: public NodeItem
 {
 public:
-    IndexedLineSetItem(const std::vector<int>&);
+    explicit IndexedLineSetItem(const std::vector<int>&);
     void write(InventorOutput& out) const override;
 
 private:
@@ -525,7 +525,7 @@ private:
 class BaseExport IndexedFaceSetItem: public NodeItem
 {
 public:
-    IndexedFaceSetItem(const std::vector<int>&);
+    explicit IndexedFaceSetItem(const std::vector<int>&);
     void write(InventorOutput& out) const override;
 
 private:
@@ -627,7 +627,7 @@ private:
 class BaseExport Text2Item: public NodeItem
 {
 public:
-    Text2Item(const std::string&);
+    explicit Text2Item(const std::string&);
     void write(InventorOutput& out) const override;
 
 private:
diff --git a/src/Base/UnitsSchemaInternal.cpp b/src/Base/UnitsSchemaInternal.cpp
index f585b2eae5..1e3c7e482d 100644
--- a/src/Base/UnitsSchemaInternal.cpp
+++ b/src/Base/UnitsSchemaInternal.cpp
@@ -326,7 +326,7 @@ UnitsSchemaInternal::schemaTranslate(const Quantity& quant, double& factor, QStr
     }
     else if (unit == Unit::HeatFlux) {
         unitString = QString::fromLatin1("W/m^2");
-        factor = 1;  //  unit signiture (0,1,-3,0,0) is length independent
+        factor = 1;  //  unit signature (0,1,-3,0,0) is length independent
     }
     else if (unit == Unit::ElectricCharge) {
         unitString = QString::fromLatin1("C");