diff --git a/.changelog/22978.txt b/.changelog/22978.txt
new file mode 100644
index 00000000000..bbb3aea076b
--- /dev/null
+++ b/.changelog/22978.txt
@@ -0,0 +1,7 @@
+```release-note:bug
+resource/aws_waf_rule_group: Prevent panic when expanding the rule group's set of `activated_rule`
+```
+
+```release-note:bug
+resource/aws_wafregional_rule_group: Prevent panic when expanding the rule group's set of `activated_rule`
+```
\ No newline at end of file
diff --git a/internal/service/waf/helpers.go b/internal/service/waf/helpers.go
index f8a7721870a..e8edc2fb136 100644
--- a/internal/service/waf/helpers.go
+++ b/internal/service/waf/helpers.go
@@ -271,7 +271,7 @@ func FlattenActivatedRules(activatedRules []*waf.ActivatedRule) []interface{} {
 
 func ExpandActivatedRule(rule map[string]interface{}) *waf.ActivatedRule {
 	r := &waf.ActivatedRule{
-		Priority: aws.Int64(rule["priority"].(int64)),
+		Priority: aws.Int64(int64(rule["priority"].(int))),
 		RuleId:   aws.String(rule["rule_id"].(string)),
 		Type:     aws.String(rule["type"].(string)),
 	}