diff --git a/clippy_lints/src/ranges.rs b/clippy_lints/src/ranges.rs
index 79e9a56af..4b514bbd4 100644
--- a/clippy_lints/src/ranges.rs
+++ b/clippy_lints/src/ranges.rs
@@ -222,13 +222,14 @@ fn check_possible_range_contains(cx: &LateContext<'_>, op: BinOpKind, l: &Expr<'
             let name = snippet_with_applicability(cx, name_span, "_", &mut applicability);
             let lo = snippet_with_applicability(cx, l_span, "_", &mut applicability);
             let hi = snippet_with_applicability(cx, u_span, "_", &mut applicability);
+            let space = if lo.ends_with('.') { " " } else { "" };
             span_lint_and_sugg(
                 cx,
                 MANUAL_RANGE_CONTAINS,
                 span,
                 &format!("manual `{}::contains` implementation", range_type),
                 "use",
-                format!("({}{}{}).contains(&{})", lo, range_op, hi, name),
+                format!("({}{}{}{}).contains(&{})", lo, space, range_op, hi, name),
                 applicability,
             );
         } else if !combine_and && ord == Some(lord) {
@@ -251,13 +252,14 @@ fn check_possible_range_contains(cx: &LateContext<'_>, op: BinOpKind, l: &Expr<'
             let name = snippet_with_applicability(cx, name_span, "_", &mut applicability);
             let lo = snippet_with_applicability(cx, l_span, "_", &mut applicability);
             let hi = snippet_with_applicability(cx, u_span, "_", &mut applicability);
+            let space = if lo.ends_with('.') { " " } else { "" };
             span_lint_and_sugg(
                 cx,
                 MANUAL_RANGE_CONTAINS,
                 span,
                 &format!("manual `!{}::contains` implementation", range_type),
                 "use",
-                format!("!({}{}{}).contains(&{})", lo, range_op, hi, name),
+                format!("!({}{}{}{}).contains(&{})", lo, space, range_op, hi, name),
                 applicability,
             );
         }
diff --git a/tests/ui/range_contains.fixed b/tests/ui/range_contains.fixed
index 632a6592a..048874a7f 100644
--- a/tests/ui/range_contains.fixed
+++ b/tests/ui/range_contains.fixed
@@ -38,4 +38,9 @@ fn main() {
     x >= 8 || x >= 12;
     x < 12 || 12 < x;
     x >= 8 || x <= 12;
+
+    // Fix #6315
+    let y = 3.;
+    (0. ..1.).contains(&y);
+    !(0. ..=1.).contains(&y);
 }
diff --git a/tests/ui/range_contains.rs b/tests/ui/range_contains.rs
index 6af0d034e..60ad259f4 100644
--- a/tests/ui/range_contains.rs
+++ b/tests/ui/range_contains.rs
@@ -38,4 +38,9 @@ fn main() {
     x >= 8 || x >= 12;
     x < 12 || 12 < x;
     x >= 8 || x <= 12;
+
+    // Fix #6315
+    let y = 3.;
+    y >= 0. && y < 1.;
+    y < 0. || y > 1.;
 }
diff --git a/tests/ui/range_contains.stderr b/tests/ui/range_contains.stderr
index 69b009eaf..bc79f1bca 100644
--- a/tests/ui/range_contains.stderr
+++ b/tests/ui/range_contains.stderr
@@ -72,5 +72,17 @@ error: manual `!RangeInclusive::contains` implementation
 LL |     999 < x || 1 > x;
    |     ^^^^^^^^^^^^^^^^ help: use: `!(1..=999).contains(&x)`
 
-error: aborting due to 12 previous errors
+error: manual `Range::contains` implementation
+  --> $DIR/range_contains.rs:44:5
+   |
+LL |     y >= 0. && y < 1.;
+   |     ^^^^^^^^^^^^^^^^^ help: use: `(0. ..1.).contains(&y)`
+
+error: manual `!RangeInclusive::contains` implementation
+  --> $DIR/range_contains.rs:45:5
+   |
+LL |     y < 0. || y > 1.;
+   |     ^^^^^^^^^^^^^^^^ help: use: `!(0. ..=1.).contains(&y)`
+
+error: aborting due to 14 previous errors