diff --git a/metrics/github/api.py b/metrics/github/api.py
index df1e6440..d2e18673 100644
--- a/metrics/github/api.py
+++ b/metrics/github/api.py
@@ -153,8 +153,8 @@ def prs_open_in_range(org, start, end):
     return list(_iter_pull_requests(org, date_range))
 
 
-def prs_closed_on_date(org, date):
-    query = f"closed:{date}"
+def prs_merged_on_date(org, date):
+    query = f"merged:{date}"
 
     return list(_iter_pull_requests(org, query))
 
diff --git a/metrics/github/backfill.py b/metrics/github/backfill.py
index a3d07667..a468aa76 100644
--- a/metrics/github/backfill.py
+++ b/metrics/github/backfill.py
@@ -40,6 +40,7 @@ def get_prs(db):
     SELECT
       date(pull_requests.created_at) as created,
       date(pull_requests.closed_at) as closed,
+      date(pull_requests.merged_at) as merged,
       authors.login as author,
       repos.name as repo,
       owners.login as org
@@ -108,11 +109,11 @@ def pr_throughput(prs, org):
             log.info("%s | %s | Processing %s opened PRs", day, org, len(opened_prs))
             process_prs(writer, opened_prs, day, name="prs_opened")
 
-            closed_prs = [
-                pr for pr in prs if pr["closed"] and date_from_iso(pr["closed"]) == day
+            merged_prs = [
+                pr for pr in prs if pr["merged"] and date_from_iso(pr["merged"]) == day
             ]
-            log.info("%s | %s | Processing %s closed PRs", day, org, len(closed_prs))
-            process_prs(writer, closed_prs, day, name="prs_closed")
+            log.info("%s | %s | Processing %s merged PRs", day, org, len(merged_prs))
+            process_prs(writer, merged_prs, day, name="prs_merged")
 
 
 @click.command()
diff --git a/metrics/github/cli.py b/metrics/github/cli.py
index acb5f99b..aaf7cb7b 100644
--- a/metrics/github/cli.py
+++ b/metrics/github/cli.py
@@ -72,9 +72,9 @@ def pr_throughput(ctx, org, date):
         log.info("%s | %s | Processing %s opened PRs", date, org, len(opened_prs))
         process_prs(writer, opened_prs, date, name="prs_opened")
 
-        closed_prs = api.prs_closed_on_date(org, date)
-        log.info("%s | %s | Processing %s closed PRs", date, org, len(closed_prs))
-        process_prs(writer, closed_prs, date, name="prs_closed")
+        merged_prs = api.prs_merged_on_date(org, date)
+        log.info("%s | %s | Processing %s merged PRs", date, org, len(merged_prs))
+        process_prs(writer, merged_prs, date, name="prs_merged")
 
 
 github.add_command(backfill)