diff --git a/app/src/main/java/org/isoron/uhabits/io/LoopDBImporter.java b/app/src/main/java/org/isoron/uhabits/io/LoopDBImporter.java
index 5ae993d7..74d6dc7b 100644
--- a/app/src/main/java/org/isoron/uhabits/io/LoopDBImporter.java
+++ b/app/src/main/java/org/isoron/uhabits/io/LoopDBImporter.java
@@ -49,6 +49,7 @@ public class LoopDBImporter extends AbstractImporter
         boolean result = (c.moveToFirst() && c.getInt(0) == 2);
 
         c.close();
+        db.close();
         return result;
     }
 
diff --git a/app/src/main/java/org/isoron/uhabits/io/RewireDBImporter.java b/app/src/main/java/org/isoron/uhabits/io/RewireDBImporter.java
index 66b89690..47fc9202 100644
--- a/app/src/main/java/org/isoron/uhabits/io/RewireDBImporter.java
+++ b/app/src/main/java/org/isoron/uhabits/io/RewireDBImporter.java
@@ -47,6 +47,7 @@ public class RewireDBImporter extends AbstractImporter
         boolean result = (c.moveToFirst() && c.getInt(0) == 2);
 
         c.close();
+        db.close();
         return result;
     }
 
@@ -64,6 +65,8 @@ public class RewireDBImporter extends AbstractImporter
                 createHabits(db);
             }
         });
+
+        db.close();
     }
 
     private void createHabits(SQLiteDatabase db)
diff --git a/app/src/main/java/org/isoron/uhabits/io/TickmateDBImporter.java b/app/src/main/java/org/isoron/uhabits/io/TickmateDBImporter.java
index be14ca2b..f0b6b977 100644
--- a/app/src/main/java/org/isoron/uhabits/io/TickmateDBImporter.java
+++ b/app/src/main/java/org/isoron/uhabits/io/TickmateDBImporter.java
@@ -47,6 +47,7 @@ public class TickmateDBImporter extends AbstractImporter
         boolean result = (c.moveToFirst() && c.getInt(0) == 2);
 
         c.close();
+        db.close();
         return result;
     }
 
@@ -64,6 +65,8 @@ public class TickmateDBImporter extends AbstractImporter
                 createHabits(db);
             }
         });
+
+        db.close();
     }
 
     private void createHabits(SQLiteDatabase db)