diff --git a/src/styles/default/pretty.jl b/src/styles/default/pretty.jl
index 3a3fda3ab..2b0107a7e 100644
--- a/src/styles/default/pretty.jl
+++ b/src/styles/default/pretty.jl
@@ -450,7 +450,7 @@ function p_literal(
     val = getsrcval(s.doc, s.offset:(s.offset+span(cst)-1))
 
     if !is_str_or_cmd(cst)
-        if kind(cst) in KSet"Float Float32" && !startswith(val, "0x")
+        if kind(cst) in KSet"Float Float32" && !startswith(val, r"[+-]?0x")
             float_suffix = if (fidx = findlast(==('f'), val)) === nothing
                 ""
             else
diff --git a/test/issues.jl b/test/issues.jl
index a9976c518..8ef39e5be 100644
--- a/test/issues.jl
+++ b/test/issues.jl
@@ -1953,4 +1953,15 @@
         sf = "using Foo: (..)"
         @test fmt(s, 4, 100) == sf
     end
+
+    @testset "921" begin
+        # These are floating point literals with hexadecimal significands. E.g. 0x1p1 is the
+        # float with with 0x1 as the significant and 1 as the exponent.
+        s = "0x1p1"
+        @test fmt(s) == s
+        s = "+0x1p1"
+        @test fmt(s) == s
+        s = "-0x1p1"
+        @test fmt(s) == s
+    end
 end