diff --git a/selene-lib/tests/lints/approx_constant/approx_constant.lua b/selene-lib/tests/lints/approx_constant/approx_constant.lua
index ce8d2987..bf22d7cf 100644
--- a/selene-lib/tests/lints/approx_constant/approx_constant.lua
+++ b/selene-lib/tests/lints/approx_constant/approx_constant.lua
@@ -2,6 +2,7 @@ local good = 3
 local good = 3.1
 local good = 3.13
 local good = 3.15
+local good = -3.15
 local good = 3.1417
 local good = 3.14159266
 
@@ -10,9 +11,11 @@ local good = 3_14
 
 local bad = 3.14
 local bad = 3.141
+local bad = -3.141
 local bad = 3.142
 local bad = 3.1415
 local bad = 3.14159265
 
 local bad = 3.14 + 1
 local bad = f(3.14 + 1)
+local bad = f(-3.14 + 1)
diff --git a/selene-lib/tests/lints/approx_constant/approx_constant.stderr b/selene-lib/tests/lints/approx_constant/approx_constant.stderr
index e84a8fcd..9743cf84 100644
--- a/selene-lib/tests/lints/approx_constant/approx_constant.stderr
+++ b/selene-lib/tests/lints/approx_constant/approx_constant.stderr
@@ -1,42 +1,54 @@
 error[approx_constant]: `math.pi` is more precise
-   ┌─ approx_constant.lua:11:13
+   ┌─ approx_constant.lua:12:13
    │
-11 │ local bad = 3.14
+12 │ local bad = 3.14
    │             ^^^^
 
 error[approx_constant]: `math.pi` is more precise
-   ┌─ approx_constant.lua:12:13
+   ┌─ approx_constant.lua:13:13
    │
-12 │ local bad = 3.141
+13 │ local bad = 3.141
    │             ^^^^^
 
 error[approx_constant]: `math.pi` is more precise
-   ┌─ approx_constant.lua:13:13
+   ┌─ approx_constant.lua:14:14
+   │
+14 │ local bad = -3.141
+   │              ^^^^^
+
+error[approx_constant]: `math.pi` is more precise
+   ┌─ approx_constant.lua:15:13
    │
-13 │ local bad = 3.142
+15 │ local bad = 3.142
    │             ^^^^^
 
 error[approx_constant]: `math.pi` is more precise
-   ┌─ approx_constant.lua:14:13
+   ┌─ approx_constant.lua:16:13
    │
-14 │ local bad = 3.1415
+16 │ local bad = 3.1415
    │             ^^^^^^
 
 error[approx_constant]: `math.pi` is more precise
-   ┌─ approx_constant.lua:15:13
+   ┌─ approx_constant.lua:17:13
    │
-15 │ local bad = 3.14159265
+17 │ local bad = 3.14159265
    │             ^^^^^^^^^^
 
 error[approx_constant]: `math.pi` is more precise
-   ┌─ approx_constant.lua:17:13
+   ┌─ approx_constant.lua:19:13
    │
-17 │ local bad = 3.14 + 1
+19 │ local bad = 3.14 + 1
    │             ^^^^
 
 error[approx_constant]: `math.pi` is more precise
-   ┌─ approx_constant.lua:18:15
+   ┌─ approx_constant.lua:20:15
    │
-18 │ local bad = f(3.14 + 1)
+20 │ local bad = f(3.14 + 1)
    │               ^^^^
 
+error[approx_constant]: `math.pi` is more precise
+   ┌─ approx_constant.lua:21:16
+   │
+21 │ local bad = f(-3.14 + 1)
+   │                ^^^^
+