diff --git a/src/Makefile.am b/src/Makefile.am
index 295f509c..5d128028 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -72,7 +72,7 @@ ACTIONS = \
 	actions/transformations/html_entity_decode.cc \
 	actions/transformations/js_decode.cc \
 	actions/transformations/length.cc \
-	actions/transformations/lowercase.cc \
+	actions/transformations/lower_case.cc \
 	actions/transformations/md5.cc \
 	actions/transformations/none.cc \
 	actions/transformations/normalise_path.cc \
diff --git a/src/actions/transformations/lowercase.cc b/src/actions/transformations/lower_case.cc
similarity index 95%
rename from src/actions/transformations/lowercase.cc
rename to src/actions/transformations/lower_case.cc
index 35a453b8..06b581f9 100644
--- a/src/actions/transformations/lowercase.cc
+++ b/src/actions/transformations/lower_case.cc
@@ -13,7 +13,7 @@
  *
  */
 
-#include "actions/transformations/lowercase.h"
+#include "actions/transformations/lower_case.h"
 
 #include <algorithm>
 #include <string>
diff --git a/src/actions/transformations/lowercase.h b/src/actions/transformations/lower_case.h
similarity index 86%
rename from src/actions/transformations/lowercase.h
rename to src/actions/transformations/lower_case.h
index 10da9d78..869d9f02 100644
--- a/src/actions/transformations/lowercase.h
+++ b/src/actions/transformations/lower_case.h
@@ -18,8 +18,8 @@
 #include "actions/action.h"
 #include "actions/transformations/transformation.h"
 
-#ifndef SRC_ACTIONS_TRANSFORMATIONS_LOWERCASE_H_
-#define SRC_ACTIONS_TRANSFORMATIONS_LOWERCASE_H_
+#ifndef SRC_ACTIONS_TRANSFORMATIONS_LOWER_CASE_H_
+#define SRC_ACTIONS_TRANSFORMATIONS_LOWER_CASE_H_
 
 #ifdef __cplusplus
 
@@ -42,4 +42,4 @@ class LowerCase : public Transformation {
 
 #endif
 
-#endif  // SRC_ACTIONS_TRANSFORMATIONS_LOWERCASE_H_
+#endif  // SRC_ACTIONS_TRANSFORMATIONS_LOWER_CASE_H_
diff --git a/src/actions/transformations/transformation.cc b/src/actions/transformations/transformation.cc
index b2d70a26..a958df53 100644
--- a/src/actions/transformations/transformation.cc
+++ b/src/actions/transformations/transformation.cc
@@ -33,7 +33,7 @@
 #include "actions/transformations/html_entity_decode.h"
 #include "actions/transformations/js_decode.h"
 #include "actions/transformations/length.h"
-#include "actions/transformations/lowercase.h"
+#include "actions/transformations/lower_case.h"
 #include "actions/transformations/md5.h"
 #include "actions/transformations/none.h"
 #include "actions/transformations/normalise_path.h"
diff --git a/test/test-cases/secrules-language-tests b/test/test-cases/secrules-language-tests
index 35f10894..e1671340 160000
--- a/test/test-cases/secrules-language-tests
+++ b/test/test-cases/secrules-language-tests
@@ -1 +1 @@
-Subproject commit 35f108949b1e54c75e95817836e2ddaba227be75
+Subproject commit e1671340cf078af3c904fca2be3e2266c5cef8b2