diff --git a/CMakeLists.txt b/CMakeLists.txt
index 51af2f7..822ee48 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,10 +6,14 @@ endif(TARGET regex)
 
 project(libregex)
 
+add_compile_options(-pedantic -Wall)
+
 add_library(regex STATIC src/libregex.c)
 add_executable(libregex src/main.c)
 add_subdirectory(external/libds)
 
+set_property(TARGET regex PROPERTY C_STANDARD 90)
+set_property(TARGET libregex PROPERTY C_STANDARD 90)
 target_include_directories(regex PUBLIC include)
 target_include_directories(libregex PUBLIC include)
 
diff --git a/include/libregex.h b/include/libregex.h
index 9586972..2428461 100644
--- a/include/libregex.h
+++ b/include/libregex.h
@@ -325,4 +325,5 @@ libregex_result regex_match_string(regex_node* root, char* string, regex_result*
  */
 void regex_result_free(regex_result* result);
 
-#endif
\ No newline at end of file
+#endif
+
diff --git a/src/libregex.c b/src/libregex.c
index 38aea20..05ca29a 100644
--- a/src/libregex.c
+++ b/src/libregex.c
@@ -597,4 +597,5 @@ void regex_result_free(regex_result* result){
     free(result->groups[index]);
   }
   result->matches = 0;
-}
\ No newline at end of file
+}
+