diff --git a/lib/std/fmt/parse_float/parse_float.zig b/lib/std/fmt/parse_float/parse_float.zig
index 6d77346e9befc868d3d5707f6ae663132ca70427..08d1c558628d060ae886e8501fe634217b99bf06 100644
--- a/lib/std/fmt/parse_float/parse_float.zig
+++ b/lib/std/fmt/parse_float/parse_float.zig
@@ -12,6 +12,14 @@ pub const ParseFloatError = error{
 };
 
 pub fn parseFloat(comptime T: type, s: []const u8) ParseFloatError!T {
+    if (@typeInfo(T) != .Float) {
+        @compileError("Cannot parse a float into a non-floating point type.");
+    }
+
+    if (T == f80) {
+        @compileError("TODO support parsing float to f80");
+    }
+
     if (s.len == 0) {
         return error.InvalidCharacter;
     }