diff --git a/api/queries_pr.go b/api/queries_pr.go
index 7ecaad50b..0ef089bb5 100644
--- a/api/queries_pr.go
+++ b/api/queries_pr.go
@@ -16,6 +16,14 @@ type PullRequestAndTotalCount struct {
 	SearchCapped bool
 }
 
+type PullRequestMergeable string
+
+const (
+	PullRequestMergeableConflicting PullRequestMergeable = "CONFLICTING"
+	PullRequestMergeableMergeable   PullRequestMergeable = "MERGEABLE"
+	PullRequestMergeableUnknown     PullRequestMergeable = "UNKNOWN"
+)
+
 type PullRequest struct {
 	ID                  string
 	Number              int
@@ -27,7 +35,7 @@ type PullRequest struct {
 	HeadRefName         string
 	HeadRefOid          string
 	Body                string
-	Mergeable           string
+	Mergeable           PullRequestMergeable
 	Additions           int
 	Deletions           int
 	ChangedFiles        int