diff --git a/testing/mozharness/configs/android/androidarm_4_3.py b/testing/mozharness/configs/android/androidarm_4_3.py
index 6e1a62c5a44f..a6b568c2dbd0 100644
--- a/testing/mozharness/configs/android/androidarm_4_3.py
+++ b/testing/mozharness/configs/android/androidarm_4_3.py
@@ -394,67 +394,83 @@ config = {
         },
         "mochitest-1": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=1"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=1"],
         },
         "mochitest-2": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=2"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=2"],
         },
         "mochitest-3": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=3"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=3"],
         },
         "mochitest-4": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=4"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=4"],
         },
         "mochitest-5": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=5"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=5"],
         },
         "mochitest-6": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=6"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=6"],
         },
         "mochitest-7": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=7"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=7"],
         },
         "mochitest-8": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=8"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=8"],
         },
         "mochitest-9": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=9"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=9"],
         },
         "mochitest-10": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=10"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=10"],
         },
         "mochitest-11": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=11"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=11"],
         },
         "mochitest-12": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=12"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=12"],
         },
         "mochitest-13": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=13"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=13"],
         },
         "mochitest-14": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=14"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=14"],
         },
         "mochitest-15": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=15"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=15"],
         },
         "mochitest-16": {
             "category": "mochitest",
-            "extra_args": ["--total-chunks=16", "--this-chunk=16"],
+            "extra_args": ["--total-chunks=20", "--this-chunk=16"],
+        },
+        "mochitest-17": {
+            "category": "mochitest",
+            "extra_args": ["--total-chunks=20", "--this-chunk=17"],
+        },
+        "mochitest-18": {
+            "category": "mochitest",
+            "extra_args": ["--total-chunks=20", "--this-chunk=18"],
+        },
+        "mochitest-19": {
+            "category": "mochitest",
+            "extra_args": ["--total-chunks=20", "--this-chunk=19"],
+        },
+        "mochitest-20": {
+            "category": "mochitest",
+            "extra_args": ["--total-chunks=20", "--this-chunk=20"],
         },
         "mochitest-chrome": {
             "category": "mochitest",