diff --git a/source/source_io/module_hs/cal_pLpR.cpp b/source/source_io/module_hs/cal_pLpR.cpp
index 41f1488a28a..a9eb2223762 100644
--- a/source/source_io/module_hs/cal_pLpR.cpp
+++ b/source/source_io/module_hs/cal_pLpR.cpp
@@ -273,9 +273,9 @@ void ModuleIO::AngularMomentumCalculator::kernel(
     // il and jl are indexes of the angular momentum,
     // iz and jz are indexes of the zeta functions
     // im and jm are indexes of the magnetic quantum numbers.
-    std::string fmtstr = "%4d%4d%4d%4d%4d%4d%4d%4d%4d%4d%4d%4d%4d";
-    fmtstr += "%" + std::to_string(precision*2) + "." + std::to_string(precision) + "e";
-    fmtstr += "%" + std::to_string(precision*2) + "." + std::to_string(precision) + "e\n";
+    std::string fmtstr = "%4d %4d %4d %4d %4d %4d %4d %4d %4d %4d %4d %4d %4d";
+    fmtstr += " %" + std::to_string(precision*2) + "." + std::to_string(precision) + "e";
+    fmtstr += " %" + std::to_string(precision*2) + "." + std::to_string(precision) + "e\n";
     FmtCore fmt(fmtstr);
 
     // placeholders