diff --git a/src/database/compile/collection.rs b/src/database/compile/collection.rs
index c3a68da..fb88623 100644
--- a/src/database/compile/collection.rs
+++ b/src/database/compile/collection.rs
@@ -12,11 +12,11 @@ impl Schema {
   ) {
     #[cfg(not(test))]
     for c in id.chars() {
-      if !c.is_ascii_lowercase() && !c.is_ascii_digit() && c != '_' && c != '.' {
+      if !c.is_ascii_lowercase() && !c.is_ascii_digit() && c != '_' && c != '.' && c != '$' {
         errors.push(crate::drop::Error {
           code: "INVALID_IDENTIFIER".to_string(),
           message: format!(
-            "Invalid character '{}' in JSON Schema '{}' property: '{}'. Identifiers must exclusively contain [a-z0-9_.]",
+            "Invalid character '{}' in JSON Schema '{}' property: '{}'. Identifiers must exclusively contain [a-z0-9_.$]",
              c, field_name, id
           ),
           details: crate::drop::ErrorDetails {