diff --git a/spec/ameba/rule/lint/unused_block_argument_spec.cr b/spec/ameba/rule/lint/unused_block_argument_spec.cr
index d5ad799c..2a577dab 100644
--- a/spec/ameba/rule/lint/unused_block_argument_spec.cr
+++ b/spec/ameba/rule/lint/unused_block_argument_spec.cr
@@ -89,6 +89,13 @@ module Ameba::Rule::Lint
         CRYSTAL
     end
 
+    it "doesn't report if used in abstract def" do
+      expect_no_issues subject, <<-CRYSTAL
+        abstract def debug(id : String, &on_message: Callback)
+        abstract def info(&on_message: Callback)
+        CRYSTAL
+    end
+
     context "super" do
       it "reports if variable is not referenced implicitly by super" do
         source = expect_issue subject, <<-CRYSTAL
diff --git a/src/ameba/rule/lint/unused_block_argument.cr b/src/ameba/rule/lint/unused_block_argument.cr
index 7fdb0f67..a3497b02 100644
--- a/src/ameba/rule/lint/unused_block_argument.cr
+++ b/src/ameba/rule/lint/unused_block_argument.cr
@@ -47,6 +47,8 @@ module Ameba::Rule::Lint
     end
 
     def test(source, node : Crystal::Def, scope : AST::Scope)
+      return if node.abstract?
+
       return unless block_arg = node.block_arg
       return unless block_arg = scope.arguments.find(&.node.== block_arg)