diff --git a/pastey-test-suite/tests/test_item.rs b/pastey-test-suite/tests/test_item.rs
index c46aa68..be4bc2b 100644
--- a/pastey-test-suite/tests/test_item.rs
+++ b/pastey-test-suite/tests/test_item.rs
@@ -140,6 +140,29 @@ mod test_to_snake {
     }
 }
 
+mod test_to_snake_number {
+    use pastey::paste;
+
+    macro_rules! m {
+        ($id:ident) => {
+            paste! {
+                const DEFAULT_SNAKE_NUMBER: &str = stringify!([<$id:snake_number>]);
+                const LOWER_SNAKE_NUMBER: &str = stringify!([<$id:snake_number:lower>]);
+                const UPPER_SNAKE_NUMBER: &str = stringify!([<$id:snake_number:upper>]);
+            }
+        };
+    }
+
+    m!(ThisIsButA1Test);
+
+    #[test]
+    fn test_to_snake_number() {
+        assert_eq!(DEFAULT_SNAKE_NUMBER, "this_is_but_a_1_test");
+        assert_eq!(LOWER_SNAKE_NUMBER, "this_is_but_a_1_test");
+        assert_eq!(UPPER_SNAKE_NUMBER, "THIS_IS_BUT_A_1_TEST");
+    }
+}
+
 mod test_to_camel {
     use pastey::paste;
 
diff --git a/src/segment.rs b/src/segment.rs
index 764966c..d6c0610 100644
--- a/src/segment.rs
+++ b/src/segment.rs
@@ -208,11 +208,14 @@ pub(crate) fn paste(segments: &[Segment]) -> Result<String> {
                     "upper" => {
                         evaluated.push(last.to_uppercase());
                     }
-                    "snake" => {
+                    "snake" | "snake_number" => {
                         let mut acc = String::new();
                         let mut prev = '_';
+                        let include_numbers = ident.to_string().as_str() == "snake_number";
                         for ch in last.chars() {
-                            if ch.is_uppercase() && prev != '_' {
+                            let should_trigger_underscore =
+                                ch.is_uppercase() || (include_numbers && ch.is_numeric());
+                            if should_trigger_underscore && prev != '_' {
                                 acc.push('_');
                             }
                             acc.push(ch);