diff --git a/F-Droid/res/values/strings.xml b/F-Droid/res/values/strings.xml
index deecc6f43..9d375edc4 100644
--- a/F-Droid/res/values/strings.xml
+++ b/F-Droid/res/values/strings.xml
@@ -63,6 +63,8 @@
 
 	<string name="inst">Installed</string>
 	<string name="not_inst">Not Installed</string>
+	<string name="inst_known_source">Installed (from %s)</string>
+	<string name="inst_unknown_source">Installed (from unknown source)</string>
 
 	<string name="added_on">Added on %s</string>
 
diff --git a/F-Droid/src/org/fdroid/fdroid/AppDetails.java b/F-Droid/src/org/fdroid/fdroid/AppDetails.java
index 119f803d4..2e8a53ff5 100644
--- a/F-Droid/src/org/fdroid/fdroid/AppDetails.java
+++ b/F-Droid/src/org/fdroid/fdroid/AppDetails.java
@@ -70,6 +70,7 @@ import org.fdroid.fdroid.data.Apk;
 import org.fdroid.fdroid.data.ApkProvider;
 import org.fdroid.fdroid.data.App;
 import org.fdroid.fdroid.data.AppProvider;
+import org.fdroid.fdroid.data.InstalledAppProvider;
 import org.fdroid.fdroid.data.Repo;
 import org.fdroid.fdroid.data.RepoProvider;
 import org.fdroid.fdroid.installer.Installer;
@@ -173,11 +174,31 @@ public class AppDetails extends ActionBarActivity implements ProgressListener, A
 
         }
 
+        private String getInstalledStatus(final Apk apk) {
+            // Definitely not installed.
+            if (apk.vercode != app.installedVersionCode) {
+                return getString(R.string.not_inst);
+            }
+            // Definitely installed this version.
+            if (mInstalledSigID != null && apk.sig != null
+                    && apk.sig.equals(mInstalledSigID)) {
+                return getString(R.string.inst);
+            }
+            // Installed the same version, but from someplace else.
+            final String installerPkgName = mPm.getInstallerPackageName(app.id);
+            if (installerPkgName != null && installerPkgName.length() > 0) {
+                final String installerLabel = InstalledAppProvider
+                    .getApplicationLabel(mctx, installerPkgName);
+                return getString(R.string.inst_known_source, installerLabel);
+            }
+            return getString(R.string.inst_unknown_source);
+        }
+
         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
 
             java.text.DateFormat df = DateFormat.getDateFormat(mctx);
-            Apk apk = getItem(position);
+            final Apk apk = getItem(position);
             ViewHolder holder;
 
             if (convertView == null) {
@@ -202,13 +223,7 @@ public class AppDetails extends ActionBarActivity implements ProgressListener, A
                     + " " + apk.version
                     + (apk.vercode == app.suggestedVercode ? "  ☆" : ""));
 
-            if (apk.vercode == app.installedVersionCode
-                    && mInstalledSigID != null && apk.sig != null
-                    && apk.sig.equals(mInstalledSigID)) {
-                holder.status.setText(getString(R.string.inst));
-            } else {
-                holder.status.setText(getString(R.string.not_inst));
-            }
+            holder.status.setText(getInstalledStatus(apk));
 
             if (apk.size > 0) {
                 holder.size.setText(Utils.getFriendlySize(apk.size));