diff --git a/compiler/rustc_ast_pretty/src/pprust/state/expr.rs b/compiler/rustc_ast_pretty/src/pprust/state/expr.rs
index cacfe9eb2f107..958bf1c58cf58 100644
--- a/compiler/rustc_ast_pretty/src/pprust/state/expr.rs
+++ b/compiler/rustc_ast_pretty/src/pprust/state/expr.rs
@@ -248,8 +248,9 @@ impl<'a> State<'a> {
         };
 
         self.print_expr_maybe_paren(lhs, left_prec);
-        self.space();
-        self.word_space(op.node.to_string());
+        self.nbsp();
+        self.word(op.node.to_string());
+        self.nbsp();
         self.print_expr_maybe_paren(rhs, right_prec)
     }
 
diff --git a/tests/ui/macros/issue-108341.rs b/tests/ui/macros/issue-108341.rs
new file mode 100644
index 0000000000000..de576f9fdbf51
--- /dev/null
+++ b/tests/ui/macros/issue-108341.rs
@@ -0,0 +1,12 @@
+// run-fail
+// error-pattern: assertion failed:
+// error-pattern: 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 == 1
+
+fn main() {
+    assert!(
+        0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9
+        + 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9
+        + 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9
+        == 1
+    );
+}