diff --git a/clippy_lints/src/literal_representation.rs b/clippy_lints/src/literal_representation.rs
index 362d45991bb..269d3c62eaf 100644
--- a/clippy_lints/src/literal_representation.rs
+++ b/clippy_lints/src/literal_representation.rs
@@ -308,7 +308,7 @@ impl LiteralDigitGrouping {
         let (part, mistyped_suffixes, is_float) = if let Some((_, exponent)) = &mut num_lit.exponent {
             (exponent, &["32", "64"][..], true)
         } else if num_lit.fraction.is_some() {
-            (&mut num_lit.integer, &["32", "64"][..], true)
+            return true;
         } else {
             (&mut num_lit.integer, &["8", "16", "32", "64"][..], false)
         };
diff --git a/tests/ui/mistyped_literal_suffix.fixed b/tests/ui/mistyped_literal_suffix.fixed
index a59384e0725..a7b36d53cd2 100644
--- a/tests/ui/mistyped_literal_suffix.fixed
+++ b/tests/ui/mistyped_literal_suffix.fixed
@@ -35,5 +35,9 @@ fn main() {
     let ok35 = 0x12345_16;
     let fail36 = 0xFFFF_FFFF_FFFF_FFFF_u64; // u64
 
+    // issue #6129
+    let ok37 = 123_32.123;
+    let ok38 = 124_64.0;
+
     let _ = 1.123_45E1_f32;
 }
diff --git a/tests/ui/mistyped_literal_suffix.rs b/tests/ui/mistyped_literal_suffix.rs
index 01e425f9f1d..c97b31965c7 100644
--- a/tests/ui/mistyped_literal_suffix.rs
+++ b/tests/ui/mistyped_literal_suffix.rs
@@ -35,5 +35,9 @@ fn main() {
     let ok35 = 0x12345_16;
     let fail36 = 0xFFFF_FFFF_FFFF_FFFF_64; // u64
 
+    // issue #6129
+    let ok37 = 123_32.123;
+    let ok38 = 124_64.0;
+
     let _ = 1.12345E1_32;
 }
diff --git a/tests/ui/mistyped_literal_suffix.stderr b/tests/ui/mistyped_literal_suffix.stderr
index 6fcd1f2f180..fb761d9bde4 100644
--- a/tests/ui/mistyped_literal_suffix.stderr
+++ b/tests/ui/mistyped_literal_suffix.stderr
@@ -91,7 +91,7 @@ LL |     let fail36 = 0xFFFF_FFFF_FFFF_FFFF_64; // u64
    |                  ^^^^^^^^^^^^^^^^^^^^^^^^ help: did you mean to write: `0xFFFF_FFFF_FFFF_FFFF_u64`
 
 error: mistyped literal suffix
-  --> $DIR/mistyped_literal_suffix.rs:38:13
+  --> $DIR/mistyped_literal_suffix.rs:42:13
    |
 LL |     let _ = 1.12345E1_32;
    |             ^^^^^^^^^^^^ help: did you mean to write: `1.123_45E1_f32`