diff --git a/clippy_utils/src/numeric_literal.rs b/clippy_utils/src/numeric_literal.rs
index 546706d51d7b..4a28c7dd9a04 100644
--- a/clippy_utils/src/numeric_literal.rs
+++ b/clippy_utils/src/numeric_literal.rs
@@ -162,6 +162,9 @@ impl<'a> NumericLiteral<'a> {
         }
 
         if let Some(suffix) = self.suffix {
+            if output.ends_with('.') {
+                output.push('0');
+            }
             output.push('_');
             output.push_str(suffix);
         }