diff --git a/.idea/dictionaries/bmarty.xml b/.idea/dictionaries/bmarty.xml
index 10c12796c0..680a1d57cf 100644
--- a/.idea/dictionaries/bmarty.xml
+++ b/.idea/dictionaries/bmarty.xml
@@ -9,6 +9,8 @@
       <w>decryptor</w>
       <w>emoji</w>
       <w>emojis</w>
+      <w>fdroid</w>
+      <w>gplay</w>
       <w>hmac</w>
       <w>ktlint</w>
       <w>linkified</w>
diff --git a/CHANGES.md b/CHANGES.md
index 657f553c36..6c9d9cef00 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -17,7 +17,7 @@ Translations 🗣:
  -
 
 Build 🧱:
- -
+ - F-Droid: fix the "-dev" issue in version name (#815)
 
 Changes in RiotX 0.13.0 (2020-01-17)
 ===================================================
diff --git a/vector/build.gradle b/vector/build.gradle
index 14ec9f2c21..bbf45dda53 100644
--- a/vector/build.gradle
+++ b/vector/build.gradle
@@ -27,7 +27,7 @@ static def generateVersionCodeFromTimestamp() {
     // It's unix timestamp, minus timestamp of October 3rd 2018 (first commit date) divided by 100: It's incremented by one every 100 seconds.
     // plus 20_000_000 for compatibility reason with the previous way the Version Code was computed
     // Note that the result will be multiplied by 10 when adding the digit for the arch
-    return ((getGitTimestamp() - 1_538_524_800 ) / 100).toInteger() + 20_000_000
+    return ((getGitTimestamp() - 1_538_524_800) / 100).toInteger() + 20_000_000
 }
 
 def generateVersionCodeFromVersionName() {
@@ -66,7 +66,8 @@ static def gitBranchName() {
     }
 }
 
-static def getVersionSuffix() {
+// For Google Play build, build on any other branch than master will have a "-dev" suffix
+static def getGplayVersionSuffix() {
     if (gitBranchName() == "master") {
         return ""
     } else {
@@ -74,6 +75,20 @@ static def getVersionSuffix() {
     }
 }
 
+static def gitTag() {
+    def cmd = "git describe --exact-match --tags"
+    return cmd.execute().text.trim()
+}
+
+// For F-Droid build, build on a not tagged commit will have a "-dev" suffix
+static def getFdroidVersionSuffix() {
+    if (gitTag() == "") {
+        return "-dev"
+    } else {
+        return ""
+    }
+}
+
 project.android.buildTypes.all { buildType ->
     buildType.javaCompileOptions.annotationProcessorOptions.arguments =
             [
@@ -102,8 +117,6 @@ android {
         // Other branches (master, features, etc.) will have version code based on application version.
         versionCode project.getVersionCode()
 
-        versionName "${versionMajor}.${versionMinor}.${versionPatch}${getVersionSuffix()}"
-
         buildConfigField "String", "GIT_REVISION", "\"${gitRevision()}\""
         resValue "string", "git_revision", "\"${gitRevision()}\""
 
@@ -190,6 +203,8 @@ android {
         gplay {
             dimension "store"
 
+            versionName "${versionMajor}.${versionMinor}.${versionPatch}${getGplayVersionSuffix()}"
+
             resValue "bool", "isGplay", "true"
             buildConfigField "boolean", "ALLOW_FCM_USE", "true"
             buildConfigField "String", "SHORT_FLAVOR_DESCRIPTION", "\"G\""
@@ -199,6 +214,8 @@ android {
         fdroid {
             dimension "store"
 
+            versionName "${versionMajor}.${versionMinor}.${versionPatch}${getFdroidVersionSuffix()}"
+
             resValue "bool", "isGplay", "false"
             buildConfigField "boolean", "ALLOW_FCM_USE", "false"
             buildConfigField "String", "SHORT_FLAVOR_DESCRIPTION", "\"F\""