diff --git a/src/Fantomas.Core.Tests/PrefixTests.fs b/src/Fantomas.Core.Tests/PrefixTests.fs
index 61f67b45c..a596bb4da 100644
--- a/src/Fantomas.Core.Tests/PrefixTests.fs
+++ b/src/Fantomas.Core.Tests/PrefixTests.fs
@@ -126,7 +126,17 @@ let operator_application_literal_values_with_sign =
       "-4.41F"
       "-4.14"
       "-12456I"
-      "-0.7833M" ]
+      "-0.7833M"
+      "+46y"
+      "+46s"
+      "+46"
+      "+46l"
+      "+423n"
+      "+46L"
+      "+3.41F"
+      "+3.14"
+      "+32456I"
+      "+0.7833M" ]
 
 [<TestCaseSource("operator_application_literal_values_with_sign")>]
 let ``operators maintain spacing from literal values which start with + or -`` (literalValue: string) =
@@ -155,7 +165,9 @@ let operator_application_literal_values_without_sign =
       "\"text\"B" ]
 
 [<TestCaseSource("operator_application_literal_values_without_sign")>]
-let ``operators maintain spacing from literal values which start without + or -`` (literalValue: string) =
+let ``no space added between prefix operators and literal values that do not start with a symbol``
+    (literalValue: string)
+    =
     formatSourceString
         $"""
 let subtractTwo = + %s{literalValue}
@@ -167,3 +179,33 @@ let subtractTwo = + %s{literalValue}
         $"""
 let subtractTwo = +%s{literalValue}
 """
+
+[<Test>]
+let ``add space between prefix and quotation`` () =
+    formatSourceString
+        """
+let _ = + <@ 1 @>
+"""
+        config
+    |> prepend newline
+    |> should
+        equal
+        """
+let _ = + <@ 1 @>
+"""
+
+[<Test>]
+let ``add space between prefix and measure`` () =
+    formatSourceString
+        """
+let _ = - +1<m>
+let _ = - -1<m>
+"""
+        config
+    |> prepend newline
+    |> should
+        equal
+        """
+let _ = - +1<m>
+let _ = - -1<m>
+"""
diff --git a/src/Fantomas.Core/CodePrinter.fs b/src/Fantomas.Core/CodePrinter.fs
index 1cf3d21fe..bb9f0d473 100644
--- a/src/Fantomas.Core/CodePrinter.fs
+++ b/src/Fantomas.Core/CodePrinter.fs
@@ -757,13 +757,20 @@ let genExpr (e: Expr) =
         let genWithSpace = genSingleTextNode node.Operator +> sepSpace +> genExpr node.Expr
 
         match node.Expr with
-        // E.g. !! @"foobar", because !!@ would be mistaken for an operator.
-        | Expr.Constant(Constant.FromText(stn)) ->
-            match stn.Text.[0] with
-            | '@'
-            | '-'
-            | '+' -> genWithSpace
-            | _ -> genWithoutSpace
+        // E.g. + <@ 1 @>
+        | Expr.Quote _ -> genWithSpace
+        | Expr.Constant(constant) ->
+            // E.g. !! @"foobar", because !!@ would be mistaken for an operator.
+            match constant with
+            | Constant.FromText(stn) ->
+                match stn.Text.[0] with
+                | '@'
+                | '-'
+                | '+' -> genWithSpace
+                | _ -> genWithoutSpace
+            // E.g. - +1<m>
+            | Constant.Measure _ -> genWithSpace
+            | Constant.Unit _ -> genWithoutSpace
         // !- $"blah{s}"
         | Expr.InterpolatedStringExpr _ -> genWithSpace
         // We don't respect SpaceBeforeLowercaseInvocation here because it can alter the meaning of the code.