diff --git a/src/Mod/Ship/Instance.py b/src/Mod/Ship/Instance.py
index 7674e871da..a223ed1d97 100644
--- a/src/Mod/Ship/Instance.py
+++ b/src/Mod/Ship/Instance.py
@@ -41,7 +41,7 @@ class Ship:
         solids -- Set of solids which will compound the ship hull.
         """
         # Add an unique property to identify the Ship instances
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "Ship",
             "True if it is a valid ship instance, False otherwise",
             None))
@@ -50,7 +50,7 @@ class Ship:
                         "Ship",
                         tooltip).IsShip = True
         # Add the main dimensions
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "Ship",
             "Ship length [m]",
             None))
@@ -58,7 +58,7 @@ class Ship:
                         "Length",
                         "Ship",
                         tooltip).Length = 0.0
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "Ship",
             "Ship breadth [m]",
             None))
@@ -66,7 +66,7 @@ class Ship:
                         "Breadth",
                         "Ship",
                         tooltip).Breadth = 0.0
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "Ship",
             "Ship draft [m]",
             None))
@@ -76,7 +76,7 @@ class Ship:
                         tooltip).Draft = 0.0
         # Add the subshapes
         obj.Shape = Part.makeCompound(solids)
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "Ship",
             "Set of external faces of the ship hull",
             None))
@@ -84,7 +84,7 @@ class Ship:
                         "ExternalFaces",
                         "Ship",
                         tooltip)
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "Ship",
             "Set of weight instances",
             None))
@@ -92,7 +92,7 @@ class Ship:
                         "Weights",
                         "Ship",
                         tooltip).Weights = []
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "Ship",
             "Set of tank instances",
             None))
@@ -100,7 +100,7 @@ class Ship:
                         "Tanks",
                         "Ship",
                         tooltip).Tanks = []
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "Ship",
             "Set of load conditions",
             None))
diff --git a/src/Mod/Ship/TankInstance.py b/src/Mod/Ship/TankInstance.py
index 5708d97b8c..1908d398ec 100644
--- a/src/Mod/Ship/TankInstance.py
+++ b/src/Mod/Ship/TankInstance.py
@@ -47,7 +47,7 @@ class Tank:
         ship -- Ship where the tank is allocated.
         """
         # Add an unique property to identify the Weight instances
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "ship_tank",
             "True if it is a valid tank instance, False otherwise",
             None))
diff --git a/src/Mod/Ship/WeightInstance.py b/src/Mod/Ship/WeightInstance.py
index 1dd4b728fa..57e55ed053 100644
--- a/src/Mod/Ship/WeightInstance.py
+++ b/src/Mod/Ship/WeightInstance.py
@@ -43,7 +43,7 @@ class Weight:
         ship -- Ship where the weight is allocated.
         """
         # Add an unique property to identify the Weight instances
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "ship_weight",
             "True if it is a valid weight instance, False otherwise",
             None))
@@ -52,7 +52,7 @@ class Weight:
                         "Weight",
                         tooltip).IsWeight = True
         # Add the mass property for puntual weights
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "ship_weight",
             "Mass [kg]",
             None))
@@ -61,7 +61,7 @@ class Weight:
                         "Weight",
                         tooltip).Mass = 0.0
         # Add the density property for linear elements
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "ship_weight",
             "Linear density [kg / m]",
             None))
@@ -70,7 +70,7 @@ class Weight:
                         "Weight",
                         tooltip).LineDens = 0.0
         # Add the area density property for surface elements
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "ship_weight",
             "Area density [kg / m^2]",
             None))
@@ -79,7 +79,7 @@ class Weight:
                         "Weight",
                         tooltip).AreaDens = 0.0
         # Add the density property for volumetric elements
-        tooltip = str(QtGui.QApplication.translate(
+        tooltip = unicode(QtGui.QApplication.translate(
             "ship_weight",
             "Density [kg / m^3]",
             None))