diff --git a/oeffi/src/de/schildbach/oeffi/directions/TripDetailsActivity.java b/oeffi/src/de/schildbach/oeffi/directions/TripDetailsActivity.java
index 1cdde02..9c01af5 100644
--- a/oeffi/src/de/schildbach/oeffi/directions/TripDetailsActivity.java
+++ b/oeffi/src/de/schildbach/oeffi/directions/TripDetailsActivity.java
@@ -552,7 +552,7 @@ public class TripDetailsActivity extends OeffiActivity implements LocationListen
                         .setText(fareTypes[fare.type.ordinal()]);
                 ((TextView) fareRow.findViewById(R.id.directions_trip_details_fare_entry_row_name)).setText(fare.name);
                 ((TextView) fareRow.findViewById(R.id.directions_trip_details_fare_entry_row_fare))
-                        .setText(String.format("%s%.2f", fare.currency.getSymbol(), fare.fare));
+                        .setText(String.format(Locale.US, "%s%.2f", fare.currency.getSymbol(), fare.fare));
                 final TextView unitView = (TextView) fareRow
                         .findViewById(R.id.directions_trip_details_fare_entry_row_unit);
                 if (fare.units != null && fare.unitName != null)
diff --git a/oeffi/src/de/schildbach/oeffi/stations/NearestFavoriteStationWidgetListService.java b/oeffi/src/de/schildbach/oeffi/stations/NearestFavoriteStationWidgetListService.java
index c9a672f..8065ee8 100644
--- a/oeffi/src/de/schildbach/oeffi/stations/NearestFavoriteStationWidgetListService.java
+++ b/oeffi/src/de/schildbach/oeffi/stations/NearestFavoriteStationWidgetListService.java
@@ -19,6 +19,7 @@ package de.schildbach.oeffi.stations;
 
 import java.util.Date;
 import java.util.List;
+import java.util.Locale;
 
 import de.schildbach.oeffi.Constants;
 import de.schildbach.oeffi.R;
@@ -127,7 +128,7 @@ public class NearestFavoriteStationWidgetListService extends RemoteViewsService
                     ? predictedTime.getTime() - plannedTime.getTime() : 0;
             final long delayMins = delay / DateUtils.MINUTE_IN_MILLIS;
             views.setViewVisibility(R.id.station_widget_entry_delay, delayMins != 0 ? View.VISIBLE : View.GONE);
-            final SpannableString delayStr = new SpannableString(String.format("(%+d)", delayMins));
+            final SpannableString delayStr = new SpannableString(String.format(Locale.US, "(%+d)", delayMins));
             delayStr.setSpan(new StyleSpan(isPredicted ? Typeface.BOLD_ITALIC : Typeface.BOLD), 0, delayStr.length(),
                     Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
             views.setTextViewText(R.id.station_widget_entry_delay, delayStr);
diff --git a/oeffi/src/de/schildbach/oeffi/stations/StationDetailsActivity.java b/oeffi/src/de/schildbach/oeffi/stations/StationDetailsActivity.java
index f9e8d3a..37d33ec 100644
--- a/oeffi/src/de/schildbach/oeffi/stations/StationDetailsActivity.java
+++ b/oeffi/src/de/schildbach/oeffi/stations/StationDetailsActivity.java
@@ -26,6 +26,7 @@ import java.util.ArrayList;
 import java.util.Date;
 import java.util.LinkedHashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
 import java.util.regex.Matcher;
@@ -780,7 +781,7 @@ public class StationDetailsActivity extends OeffiActivity implements StationsAwa
             final long delay = predictedTime != null && plannedTime != null
                     ? predictedTime.getTime() - plannedTime.getTime() : 0;
             final long delayMins = delay / DateUtils.MINUTE_IN_MILLIS;
-            delayView.setText(delayMins != 0 ? String.format("(%+d)", delayMins) + ' ' : "");
+            delayView.setText(delayMins != 0 ? String.format(Locale.US, "(%+d)", delayMins) + ' ' : "");
             delayView.setTypeface(Typeface.DEFAULT, isPredicted ? Typeface.ITALIC : Typeface.NORMAL);
 
             // line