diff --git a/.travis.yml b/.travis.yml
index 6c60bf443..f434edf4e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,7 @@ before_install:
 
 install:
   - python -m pip install -r requirements-dev.txt
+  - python -m pip install pytest-ordering==0.5.*
   - sudo apt-get install cython3
   - sudo apt-get install libhdf5-dev
   - python setup.py build_ext --inplace
diff --git a/gwhat/meteo/dwnld_weather_data.py b/gwhat/meteo/dwnld_weather_data.py
index 3072e460c..af6e84de8 100644
--- a/gwhat/meteo/dwnld_weather_data.py
+++ b/gwhat/meteo/dwnld_weather_data.py
@@ -623,8 +623,8 @@ def generate_html_table(self, cdf):
         min_year = cdf['Minimum Year']
         max_year = cdf['Maximum Year']
 
-        fields = ['T<sub>max<\sub>', 'T<sub>min<\sub>', 'T<sub>mean<\sub>',
-                  'P<sub>tot<\sub>']
+        fields = ['T<sub>max</sub>', 'T<sub>min</sub>', 'T<sub>mean</sub>',
+                  'P<sub>tot</sub>']
 
         html = """
                <p align="center">
diff --git a/gwhat/meteo/gapfill_weather_postprocess.py b/gwhat/meteo/gapfill_weather_postprocess.py
index 01870b4ba..3eda8280f 100644
--- a/gwhat/meteo/gapfill_weather_postprocess.py
+++ b/gwhat/meteo/gapfill_weather_postprocess.py
@@ -468,7 +468,7 @@ def plot_gamma_dist(Ymes, Ypre, fname, language='English'):
         if label >= 1:
             ylabels.append('%d' % label)
         elif label <= 10**-3:
-            ylabels.append('$\mathdefault{10^{%d}}$' % np.log10(label))
+            ylabels.append('$\\mathdefault{10^{%d}}$' % np.log10(label))
         else:
             ylabels.append(str(label))
     ax0.set_yticklabels(ylabels)
diff --git a/gwhat/meteo/weather_viewer.py b/gwhat/meteo/weather_viewer.py
index 83d5b6534..8184d3616 100644
--- a/gwhat/meteo/weather_viewer.py
+++ b/gwhat/meteo/weather_viewer.py
@@ -943,7 +943,7 @@ def select_export_file(self, time_frame, savefilename=None):
     app.setFont(ft)
 
     fmeteo = ("..\\..\\Projects\\Example\\Meteo\\Output\\"
-              "MARIEVILLE (7024627)\MARIEVILLE (7024627)_1980-2017.out")
+              "MARIEVILLE (7024627)\\MARIEVILLE (7024627)_1980-2017.out")
     wxdset = WXDataFrame(fmeteo)
 
     w = WeatherViewer()
diff --git a/gwhat/projet/reader_projet.py b/gwhat/projet/reader_projet.py
index 9d62f6b1a..3b762b281 100644
--- a/gwhat/projet/reader_projet.py
+++ b/gwhat/projet/reader_projet.py
@@ -204,7 +204,7 @@ def add_wldset(self, name, df):
         Add the water level dataset to the project hdf5 file.
 
         A dataset name must be at least one charater long and can't contain
-        any of the following special characters: \ / : * ? " < > |
+        any of the following special characters: \\ / : * ? " < > |
         """
         if not is_dsetname_valid(name):
             raise ValueError("The name of the dataset is not valid.")
@@ -290,7 +290,7 @@ def add_wxdset(self, name, df):
         Add the weather dataset to the project hdf5 file.
 
         A dataset name must be at least one charater long and can't contain
-        any of the following special characters: \ / : * ? " < > |
+        any of the following special characters: \\ / : * ? " < > |
         """
         if not is_dsetname_valid(name):
             raise ValueError("The name of the dataset is not valid.")