diff --git a/core/bootstrap/syntax.factor b/core/bootstrap/syntax.factor
index b6d14df47d..c57266cef6 100644
--- a/core/bootstrap/syntax.factor
+++ b/core/bootstrap/syntax.factor
@@ -140,6 +140,14 @@ IN: bootstrap.syntax
         "![=====["
         "![======["
 
+        "#[["
+        "#[=["
+        "#[==["
+        "#[===["
+        "#[====["
+        "#[=====["
+        "#[======["
+
         "I[["
         "I[=["
         "I[==["
diff --git a/core/syntax/syntax.factor b/core/syntax/syntax.factor
index 3ae45513ba..55665766ce 100644
--- a/core/syntax/syntax.factor
+++ b/core/syntax/syntax.factor
@@ -420,6 +420,14 @@ IN: bootstrap.syntax
     "![=====[" [ "]=====]" parse-multiline-string0 drop ] define-core-syntax
     "![======[" [ "]======]" parse-multiline-string0 drop ] define-core-syntax
 
+    "#[[" [ "]]" parse-multiline-string0 drop ] define-core-syntax
+    "#[=[" [ "]=]" parse-multiline-string0 drop ] define-core-syntax
+    "#[==[" [ "]==]" parse-multiline-string0 drop ] define-core-syntax
+    "#[===[" [ "]===]" parse-multiline-string0 drop ] define-core-syntax
+    "#[====[" [ "]====]" parse-multiline-string0 drop ] define-core-syntax
+    "#[=====[" [ "]=====]" parse-multiline-string0 drop ] define-core-syntax
+    "#[======[" [ "]======]" parse-multiline-string0 drop ] define-core-syntax
+
     "I[[" [ "]]" define-interpolate-syntax ] define-core-syntax
     "I[=[" [ "]=]" define-interpolate-syntax ] define-core-syntax
     "I[==[" [ "]==]" define-interpolate-syntax ] define-core-syntax