diff --git a/lib/reline/unicode/east_asian_width.rb b/lib/reline/unicode/east_asian_width.rb
index b6e4f570e2..7483c78936 100644
--- a/lib/reline/unicode/east_asian_width.rb
+++ b/lib/reline/unicode/east_asian_width.rb
@@ -7,7 +7,7 @@ class Reline::Unicode::EastAsianWidth
     \u{3000}
     \u{FF01}-\u{FF60}
     \u{FFE0}-\u{FFE6}
-  ).join }])/x
+  ).join }])/
 
   # Halfwidth
   TYPE_H = /^([#{ %W(
@@ -18,7 +18,7 @@ class Reline::Unicode::EastAsianWidth
     \u{FFD2}-\u{FFD7}
     \u{FFDA}-\u{FFDC}
     \u{FFE8}-\u{FFEE}
-  ).join }])/x
+  ).join }])/
 
   # Wide
   TYPE_W = /^([#{ %W(
@@ -136,7 +136,7 @@ class Reline::Unicode::EastAsianWidth
     \u{1FAD0}-\u{1FAD6}
     \u{20000}-\u{2FFFD}
     \u{30000}-\u{3FFFD}
-  ).join }])/x
+  ).join }])/
 
   # Narrow
   TYPE_NA = /^([#{ %W(
@@ -147,7 +147,7 @@ class Reline::Unicode::EastAsianWidth
     \u{00AF}
     \u{27E6}-\u{27ED}
     \u{2985}-\u{2986}
-  ).join }])/x
+  ).join }])/
 
   # Ambiguous
   TYPE_A = /^([#{ %W(
@@ -330,7 +330,7 @@ class Reline::Unicode::EastAsianWidth
     \u{E0100}-\u{E01EF}
     \u{F0000}-\u{FFFFD}
     \u{100000}-\u{10FFFD}
-  ).join }])/x
+  ).join }])/
 
   # Neutral
   TYPE_N = /^([#{ %W(
@@ -1160,5 +1160,5 @@ class Reline::Unicode::EastAsianWidth
     \u{1FBF0}-\u{1FBF9}
     \u{E0001}
     \u{E0020}-\u{E007F}
-  ).join }])/x
+  ).join }])/
 end