diff --git a/packages/ddmarlinpandora/package.py b/packages/ddmarlinpandora/package.py
index 9a8df17a..9563ef16 100644
--- a/packages/ddmarlinpandora/package.py
+++ b/packages/ddmarlinpandora/package.py
@@ -48,7 +48,7 @@ class Ddmarlinpandora(CMakePackage, Ilcsoftpackage):
 
     def setup_build_environment(self, env):
         if "+monitoring" in self.spec:
-            env.set('PANDORA_MONITORING', 'ON')
+            env.set("PANDORA_MONITORING", "ON")
 
     def setup_run_environment(self, env):
         env.prepend_path("MARLIN_DLL", self.prefix.lib + "/libDDMarlinPandora.so")
diff --git a/packages/larcontent/package.py b/packages/larcontent/package.py
index 6bb0a2fa..1336ab44 100644
--- a/packages/larcontent/package.py
+++ b/packages/larcontent/package.py
@@ -45,7 +45,7 @@ class Larcontent(CMakePackage):
 
     def setup_build_environment(self, env):
         if "+monitoring" in self.spec:
-            env.set('PANDORA_MONITORING', 'ON')
+            env.set("PANDORA_MONITORING", "ON")
 
     def cmake_args(self):
         args = [
diff --git a/packages/lccontent/package.py b/packages/lccontent/package.py
index f47aae94..2deee98e 100644
--- a/packages/lccontent/package.py
+++ b/packages/lccontent/package.py
@@ -40,7 +40,7 @@ class Lccontent(CMakePackage):
 
     def setup_build_environment(self, env):
         if "+monitoring" in self.spec:
-            env.set('PANDORA_MONITORING', 'ON')
+            env.set("PANDORA_MONITORING", "ON")
 
     def cmake_args(self):
         args = [