diff --git a/core/src/main/java/info/openrocket/core/preferences/ORPreferences.java b/core/src/main/java/info/openrocket/core/preferences/ORPreferences.java
index a8f80188c..5db93d996 100644
--- a/core/src/main/java/info/openrocket/core/preferences/ORPreferences.java
+++ b/core/src/main/java/info/openrocket/core/preferences/ORPreferences.java
@@ -35,7 +35,7 @@ import info.openrocket.core.util.MathUtil;
 import info.openrocket.core.util.StateChangeListener;
 import info.openrocket.core.util.UniqueID;
 
-public abstract class ORPreferences implements ChangeSource {
+public abstract class ORPreferences implements ChangeSource, Preferences {
 	private static final String SPLIT_CHARACTER = "|";
 
 	/*
diff --git a/core/src/main/java/info/openrocket/core/preferences/Preferences.java b/core/src/main/java/info/openrocket/core/preferences/Preferences.java
new file mode 100644
index 000000000..4032264d9
--- /dev/null
+++ b/core/src/main/java/info/openrocket/core/preferences/Preferences.java
@@ -0,0 +1,19 @@
+package info.openrocket.core.preferences;
+
+public interface Preferences {
+	boolean getBoolean(String key, boolean defaultValue);
+
+	void putBoolean(String key, boolean value);
+
+	int getInt(String key, int defaultValue);
+
+	void putInt(String key, int value);
+
+	double getDouble(String key, double defaultValue);
+
+	void putDouble(String key, double value);
+
+	String getString(String key, String defaultValue);
+
+	void putString(String key, String value);
+}