diff --git a/crates/zed/src/languages/c/highlights.scm b/crates/zed/src/languages/c/highlights.scm
index 007c871ffaf33edddf634aa467dd86ce9e718377..064ec61a378beb00417e6b6716a6f1358daa5cbf 100644
--- a/crates/zed/src/languages/c/highlights.scm
+++ b/crates/zed/src/languages/c/highlights.scm
@@ -86,7 +86,7 @@
 (identifier) @variable
 
 ((identifier) @constant
- (#match? @constant "^[A-Z][A-Z\\d_]*$"))
+ (#match? @constant "^_*[A-Z][A-Z\\d_]*$"))
 
 (call_expression
   function: (identifier) @function)
diff --git a/crates/zed/src/languages/cpp/highlights.scm b/crates/zed/src/languages/cpp/highlights.scm
index b832fb4e2ded8d5ccdc295f7fd429ed85df16c62..bcfa01ca5c6aca231d444026af94c7f6c6b32f51 100644
--- a/crates/zed/src/languages/cpp/highlights.scm
+++ b/crates/zed/src/languages/cpp/highlights.scm
@@ -37,7 +37,7 @@
 (type_identifier) @type
 
 ((identifier) @constant
- (#match? @constant "^[A-Z][A-Z\\d_]*$"))
+ (#match? @constant "^_*[A-Z][A-Z\\d_]*$"))
 
 (field_identifier) @property
 (statement_identifier) @label
diff --git a/crates/zed/src/languages/javascript/highlights.scm b/crates/zed/src/languages/javascript/highlights.scm
index 773780a8e0109a69a7ce40907f4ba0438a765a4d..bd1986b6b3aa9d00c3596f4b8e927c7961078219 100644
--- a/crates/zed/src/languages/javascript/highlights.scm
+++ b/crates/zed/src/languages/javascript/highlights.scm
@@ -51,7 +51,7 @@
   (shorthand_property_identifier)
   (shorthand_property_identifier_pattern)
  ] @constant
- (#match? @constant "^[A-Z_][A-Z\\d_]+$"))
+ (#match? @constant "^_*[A-Z_][A-Z\\d_]*$"))
 
 ; Literals
 
diff --git a/crates/zed/src/languages/python/highlights.scm b/crates/zed/src/languages/python/highlights.scm
index 118af92aaaff8fdf28ba75aa0456931f04fb5aa2..71ab963d82664db4dd9a66b9e9ac0e85449caf57 100644
--- a/crates/zed/src/languages/python/highlights.scm
+++ b/crates/zed/src/languages/python/highlights.scm
@@ -21,7 +21,7 @@
  (#match? @type "^[A-Z]"))
 
 ((identifier) @constant
- (#match? @constant "^[A-Z][A-Z_]*$"))
+ (#match? @constant "^_*[A-Z][A-Z\\d_]*$"))
 
 ; Builtin functions
 
diff --git a/crates/zed/src/languages/rust/highlights.scm b/crates/zed/src/languages/rust/highlights.scm
index d717c5d45985c6015e52b12df94b826257bfb8fc..98ea1ee40ea1f3bebf13ae392e9c3192bbe79c51 100644
--- a/crates/zed/src/languages/rust/highlights.scm
+++ b/crates/zed/src/languages/rust/highlights.scm
@@ -33,7 +33,7 @@
 
 ; Assume all-caps names are constants
 ((identifier) @constant
- (#match? @constant "^[A-Z][A-Z\\d_]+$"))
+ (#match? @constant "^_*[A-Z][A-Z\\d_]*$"))
 
 [
   "("
diff --git a/crates/zed/src/languages/typescript/highlights.scm b/crates/zed/src/languages/typescript/highlights.scm
index 773780a8e0109a69a7ce40907f4ba0438a765a4d..bd1986b6b3aa9d00c3596f4b8e927c7961078219 100644
--- a/crates/zed/src/languages/typescript/highlights.scm
+++ b/crates/zed/src/languages/typescript/highlights.scm
@@ -51,7 +51,7 @@
   (shorthand_property_identifier)
   (shorthand_property_identifier_pattern)
  ] @constant
- (#match? @constant "^[A-Z_][A-Z\\d_]+$"))
+ (#match? @constant "^_*[A-Z_][A-Z\\d_]*$"))
 
 ; Literals