diff --git a/tests/ui/excessive_precision.fixed b/tests/ui/excessive_precision.fixed
index 90376620a9f..f57191d2ae5 100644
--- a/tests/ui/excessive_precision.fixed
+++ b/tests/ui/excessive_precision.fixed
@@ -60,4 +60,7 @@ fn main() {
 
     // issue #2840
     let num = 0.000_000_000_01e-10f64;
+
+    // issue #7744
+    let _ = 2.225_073_858_507_201e-_308_f64;
 }
diff --git a/tests/ui/excessive_precision.rs b/tests/ui/excessive_precision.rs
index ce4722a90f9..4db6e4d4831 100644
--- a/tests/ui/excessive_precision.rs
+++ b/tests/ui/excessive_precision.rs
@@ -60,4 +60,7 @@ fn main() {
 
     // issue #2840
     let num = 0.000_000_000_01e-10f64;
+
+    // issue #7744
+    let _ = 2.225_073_858_507_201_1e-308_f64;
 }
diff --git a/tests/ui/excessive_precision.stderr b/tests/ui/excessive_precision.stderr
index e59c20c30b4..4c8194b1d86 100644
--- a/tests/ui/excessive_precision.stderr
+++ b/tests/ui/excessive_precision.stderr
@@ -78,5 +78,11 @@ error: float has excessive precision
 LL |     let bad_bige32: f32 = 1.123_456_788_888E-10;
    |                           ^^^^^^^^^^^^^^^^^^^^^ help: consider changing the type or truncating it to: `1.123_456_8E-10`
 
-error: aborting due to 13 previous errors
+error: float has excessive precision
+  --> $DIR/excessive_precision.rs:65:13
+   |
+LL |     let _ = 2.225_073_858_507_201_1e-308_f64;
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing the type or truncating it to: `2.225_073_858_507_201e-_308_f64`
+
+error: aborting due to 14 previous errors