diff --git a/src/pydna/myprimers.py b/src/pydna/myprimers.py
index a6f4dfa4..2f1ac5bb 100644
--- a/src/pydna/myprimers.py
+++ b/src/pydna/myprimers.py
@@ -156,7 +156,7 @@ def pydna_code_from_list(self, lst: list):
             try:
                 prstrs.index(str(p.seq).upper())
             except ValueError as e:
-                print(f"{p.format('fasta-2line')}")
+                print(f"{p.format('primer')}")
                 err = e
             else:
                 indices.append(self.data.index(p))
@@ -168,7 +168,7 @@ def pydna_code_from_list(self, lst: list):
         msg += f"{self.identifier} = {curly}\n\n"
         msg += ", ".join(f"{self.identifier}[{i}]" for i in indices)
         msg += " = parse_primers('''\n\n"
-        msg += "\n".join(self[i].format("fasta-2line") for i in indices)
+        msg += "\n".join(self[i].format("primer") for i in indices)
         msg += "\n''')"
         return _pretty_str(msg)
 
diff --git a/src/pydna/seqrecord.py b/src/pydna/seqrecord.py
index 1baa81e2..49e230a4 100755
--- a/src/pydna/seqrecord.py
+++ b/src/pydna/seqrecord.py
@@ -628,7 +628,7 @@ def removeprefix(text, prefix):
             )
         if format == "primer":
             return _pretty_str(
-                f">{self.id} {len(self)}-mer {removeprefix(self.description, self.name).strip()}\n{str(self.seq)}\n"
+                f">{self.id} {len(self)}-mer{removeprefix(self.description, self.name).strip()}\n{str(self.seq)}\n"
             )
         return _pretty_str(super().__format__(format))
 
diff --git a/tests/test_module_myprimers.py b/tests/test_module_myprimers.py
index dbfe73b2..8a3b3664 100644
--- a/tests/test_module_myprimers.py
+++ b/tests/test_module_myprimers.py
@@ -70,16 +70,16 @@ def test_PrimerList_init(monkeypatch):
 
     p[0], p[1], p[2], p[3] = parse_primers('''
 
-    >0_primer
+    >0_primer 8-mer
     tttttttt
 
-    >1_primer
+    >1_primer 8-mer
     gggggggg
 
-    >2_primer
+    >2_primer 8-mer
     cccccccc
 
-    >3_primer
+    >3_primer 8-mer
     aaaaaaaa
 
     ''')"""
@@ -145,4 +145,4 @@ def test_find_duplicate_primers(monkeypatch):
 
 
 if __name__ == "__main__":
-    pytest.main([__file__, "-v", "-s"])
+    pytest.main([__file__, "-vvv", "-s"])