diff --git a/Makefile.in b/Makefile.in
index 14993f14f52..7c036fd6f7a 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -528,7 +528,8 @@ docsnap: doc/rust.pdf
 # Float doesn't work in boot
 
 FLOAT_XFAILS := $(S)src/test/run-pass/float.rs \
-                $(S)src/test/run-pass/float2.rs
+                $(S)src/test/run-pass/float2.rs \
+                $(S)src/test/run-pass/float-signature.rs
 
 # Temporarily xfail tests broken by the nominal-tags change.
 
diff --git a/src/Makefile b/src/Makefile
index 66c87e9afd7..5079548f11a 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -420,7 +420,8 @@ self: $(CFG_RUSTC)
 # Float doesn't work in boot
 
 FLOAT_XFAILS := test/run-pass/float.rs \
-                test/run-pass/float2.rs
+                test/run-pass/float2.rs \
+                test/run-pass/float-signature.rs
 
 # Temporarily xfail tests broken by the nominal-tags change.
 
diff --git a/src/comp/front/parser.rs b/src/comp/front/parser.rs
index 9e13e706af4..063bc0e178f 100644
--- a/src/comp/front/parser.rs
+++ b/src/comp/front/parser.rs
@@ -349,6 +349,7 @@ impure fn parse_ty(parser p) -> @ast.ty {
         case (token.BOOL) { p.bump(); t = ast.ty_bool; }
         case (token.INT) { p.bump(); t = ast.ty_int; }
         case (token.UINT) { p.bump(); t = ast.ty_uint; }
+        case (token.FLOAT) { p.bump(); t = ast.ty_float; }
         case (token.STR) { p.bump(); t = ast.ty_str; }
         case (token.CHAR) { p.bump(); t = ast.ty_char; }
         case (token.MACH(?tm)) { p.bump(); t = ast.ty_machine(tm); }
diff --git a/src/comp/middle/fold.rs b/src/comp/middle/fold.rs
index 5daa7f1da72..a1b7761201b 100644
--- a/src/comp/middle/fold.rs
+++ b/src/comp/middle/fold.rs
@@ -1,5 +1,5 @@
 import std.map.hashmap;
-import std.option;
+ import std.option;
 import std.option.some;
 import std.option.none;
 
@@ -44,6 +44,7 @@ type ast_fold[ENV] =
      (fn(&ENV e, &span sp) -> @ty)                fold_ty_bool,
      (fn(&ENV e, &span sp) -> @ty)                fold_ty_int,
      (fn(&ENV e, &span sp) -> @ty)                fold_ty_uint,
+     (fn(&ENV e, &span sp) -> @ty)                fold_ty_float,
      (fn(&ENV e, &span sp, ty_mach tm) -> @ty)    fold_ty_machine,
      (fn(&ENV e, &span sp) -> @ty)                fold_ty_char,
      (fn(&ENV e, &span sp) -> @ty)                fold_ty_str,
@@ -337,6 +338,7 @@ fn fold_ty[ENV](&ENV env, ast_fold[ENV] fld, @ty t) -> @ty {
         case (ast.ty_bool) { ret fld.fold_ty_bool(env_, t.span); }
         case (ast.ty_int) { ret fld.fold_ty_int(env_, t.span); }
         case (ast.ty_uint) { ret fld.fold_ty_uint(env_, t.span); }
+        case (ast.ty_float) { ret fld.fold_ty_float(env_, t.span); }
 
         case (ast.ty_machine(?m)) {
             ret fld.fold_ty_machine(env_, t.span, m);
@@ -1064,6 +1066,10 @@ fn identity_fold_ty_uint[ENV](&ENV env, &span sp) -> @ty {
     ret @respan(sp, ast.ty_uint);
 }
 
+fn identity_fold_ty_float[ENV](&ENV env, &span sp) -> @ty {
+    ret @respan(sp, ast.ty_float);
+}
+
 fn identity_fold_ty_machine[ENV](&ENV env, &span sp,
                                  ty_mach tm) -> @ty {
     ret @respan(sp, ast.ty_machine(tm));
@@ -1515,6 +1521,7 @@ fn new_identity_fold[ENV]() -> ast_fold[ENV] {
          fold_ty_bool    = bind identity_fold_ty_bool[ENV](_,_),
          fold_ty_int     = bind identity_fold_ty_int[ENV](_,_),
          fold_ty_uint    = bind identity_fold_ty_uint[ENV](_,_),
+         fold_ty_float   = bind identity_fold_ty_float[ENV](_,_),
          fold_ty_machine = bind identity_fold_ty_machine[ENV](_,_,_),
          fold_ty_char    = bind identity_fold_ty_char[ENV](_,_),
          fold_ty_str     = bind identity_fold_ty_str[ENV](_,_),
diff --git a/src/comp/middle/metadata.rs b/src/comp/middle/metadata.rs
index ce33658f44c..e384092ba5d 100644
--- a/src/comp/middle/metadata.rs
+++ b/src/comp/middle/metadata.rs
@@ -61,6 +61,7 @@ fn sty_str(ty.sty st, def_str ds) -> str {
         case (ty.ty_bool) {ret "b";}
         case (ty.ty_int) {ret "i";}
         case (ty.ty_uint) {ret "u";}
+        case (ty.ty_float) {ret "l";}
         case (ty.ty_machine(?mach)) {
             alt (mach) {
                 case (common.ty_u8) {ret "Mb";}
diff --git a/src/comp/middle/typeck.rs b/src/comp/middle/typeck.rs
index 4175af6a99f..a52b39e2ac8 100644
--- a/src/comp/middle/typeck.rs
+++ b/src/comp/middle/typeck.rs
@@ -306,6 +306,7 @@ fn ast_ty_to_ty(ty_getter getter, &@ast.ty ast_ty) -> @ty.t {
         case (ast.ty_bool)         { sty = ty.ty_bool; }
         case (ast.ty_int)          { sty = ty.ty_int; }
         case (ast.ty_uint)         { sty = ty.ty_uint; }
+        case (ast.ty_float)        { sty = ty.ty_float; }
         case (ast.ty_machine(?tm)) { sty = ty.ty_machine(tm); }
         case (ast.ty_char)         { sty = ty.ty_char; }
         case (ast.ty_str)          { sty = ty.ty_str; }
diff --git a/src/test/run-pass/float-signature.rs b/src/test/run-pass/float-signature.rs
new file mode 100644
index 00000000000..da18390d69b
--- /dev/null
+++ b/src/test/run-pass/float-signature.rs
@@ -0,0 +1,10 @@
+fn main() {
+    fn foo(float n) -> float {
+        ret n + 0.12345;
+    }
+
+    let float n = 0.1;
+    let float m = foo(n);
+
+    log m;
+}