diff --git a/include/sessions.h b/include/sessions.h
index 209642b..06118d7 100644
--- a/include/sessions.h
+++ b/include/sessions.h
@@ -19,27 +19,27 @@ enum ExecType {
 };
 
 struct desktop_exec {
-  char** args;
+  char* NULLABLE* NNULLABLE args;
   int arg_count;
 };
 
 struct session_exec {
   enum ExecType typ;
   union {
-    char* shell;
+    char* NNULLABLE shell;
     struct desktop_exec desktop;
   };
 };
 
-static inline struct session_exec session_exec_shell(char* shell) {
+static inline struct session_exec session_exec_shell(char* NNULLABLE shell) {
   return (struct session_exec){
       .typ = EXEC_SHELL,
       .shell = shell,
   };
 }
 
-static inline struct session_exec session_exec_desktop(int arg_count,
-                                                       char** args) {
+static inline struct session_exec session_exec_desktop(
+    int arg_count, char* NULLABLE* NNULLABLE args) {
   return (struct session_exec){
       .typ = EXEC_DESKTOP,
       .desktop =
@@ -50,8 +50,8 @@ static inline struct session_exec session_exec_desktop(int arg_count,
   };
 }
 
-static inline int session_exec_exec(struct session_exec* exec,
-                                    char** NNULLABLE envlist) {
+static inline int session_exec_exec(struct session_exec* NNULLABLE exec,
+                                    char* NULLABLE* NNULLABLE envlist) {
   switch (exec->typ) {
     case EXEC_SHELL:
       return execle(exec->shell, exec->shell, NULL, envlist);
diff --git a/src/auth.c b/src/auth.c
index 8677727..00ab01a 100644
--- a/src/auth.c
+++ b/src/auth.c
@@ -19,7 +19,7 @@
 #include "util.h"
 
 static void try_source_file(struct Vector* NNULLABLE vec_envlist,
-                     char* NNULLABLE filepath) {
+                            char* NNULLABLE filepath) {
   log_printf("sourcing %s\n", filepath);
   FILE* file2source = fopen(filepath, "r");
   if (file2source == NULL) {
@@ -49,9 +49,9 @@ static void try_source_file(struct Vector* NNULLABLE vec_envlist,
 }
 
 static void source_paths(struct Vector* NNULLABLE vec_envlist,
-                  struct Vector* NNULLABLE abs_source,
-                  const char* NULLABLE user_home,
-                  struct Vector* NNULLABLE user_source) {
+                         struct Vector* NNULLABLE abs_source,
+                         const char* NULLABLE user_home,
+                         struct Vector* NNULLABLE user_source) {
   for (size_t i = 0; i < abs_source->length; i++) {
     char* path = vec_get(abs_source, i);
     try_source_file(vec_envlist, path);