diff --git a/spec/ameba/rule/style/verbose_block_spec.cr b/spec/ameba/rule/style/verbose_block_spec.cr
index 3689cecb..18ffd6fd 100644
--- a/spec/ameba/rule/style/verbose_block_spec.cr
+++ b/spec/ameba/rule/style/verbose_block_spec.cr
@@ -84,6 +84,7 @@ module Ameba::Rule::Style
         source = Source.new %(
           (1..3).sum { |i| +i }
           (1..3).sum { |i| -i }
+          (1..3).sum { |i| ~i }
         )
         rule = VerboseBlock.new
         rule
diff --git a/src/ameba/rule/style/verbose_block.cr b/src/ameba/rule/style/verbose_block.cr
index d5049091..1a1cbacd 100644
--- a/src/ameba/rule/style/verbose_block.cr
+++ b/src/ameba/rule/style/verbose_block.cr
@@ -51,7 +51,7 @@ module Ameba::Rule::Style
       a_location.line_number == b_location.line_number
     end
 
-    private PREFIX_OPERATORS = {"+", "-"}
+    private PREFIX_OPERATORS = {"+", "-", "~"}
     private OPERATOR_CHARS   =
       {'[', ']', '!', '=', '>', '<', '~', '+', '-', '*', '/', '%', '^', '|', '&'}