diff --git a/src/DIRAC/Core/Security/DiracX.py b/src/DIRAC/Core/Security/DiracX.py
index 8e866dd28d7..f5ff210fd23 100644
--- a/src/DIRAC/Core/Security/DiracX.py
+++ b/src/DIRAC/Core/Security/DiracX.py
@@ -40,7 +40,7 @@
 
 PEM_BEGIN = "-----BEGIN DIRACX-----"
 PEM_END = "-----END DIRACX-----"
-RE_DIRACX_PEM = re.compile(rf"{PEM_BEGIN}\n(.*)\n{PEM_END}", re.MULTILINE | re.DOTALL)
+RE_DIRACX_PEM = re.compile(rf"{PEM_BEGIN}\n(.*?)\n{PEM_END}", re.DOTALL)
 
 
 @convertToReturnValue