diff --git a/src/FileFormats/NL/NL.jl b/src/FileFormats/NL/NL.jl
index d361e3f75d..5c957be11b 100644
--- a/src/FileFormats/NL/NL.jl
+++ b/src/FileFormats/NL/NL.jl
@@ -508,7 +508,12 @@ function _process_constraint(
     return
 end
 
-_str(x::Float64) = isinteger(x) ? string(round(Int, x)) : string(x)
+function _str(x::Float64)
+    if isinteger(x) && (typemin(Int) <= x <= typemax(Int))
+        return string(round(Int, x))
+    end
+    return string(x)
+end
 
 _write_term(io, x::Float64, ::Any) = println(io, "n", _str(x))
 _write_term(io, x::Int, ::Any) = println(io, "o", x)
diff --git a/test/FileFormats/NL/NL.jl b/test/FileFormats/NL/NL.jl
index 24b37e1ea2..c20a25571b 100644
--- a/test/FileFormats/NL/NL.jl
+++ b/test/FileFormats/NL/NL.jl
@@ -1014,6 +1014,14 @@ function test_moi()
     return
 end
 
+function test_float_rounding()
+    @test NL._str(1.0) == "1"
+    @test NL._str(1.2) == "1.2"
+    @test NL._str(1e50) == "1.0e50"
+    @test NL._str(-1e50) == "-1.0e50"
+    return
+end
+
 function runtests()
     for name in names(@__MODULE__; all = true)
         if startswith("$(name)", "test_")