diff --git a/syscalls.h b/syscalls.h
index 03a2177..a1f6ca9 100644
--- a/syscalls.h
+++ b/syscalls.h
@@ -129,7 +129,7 @@ enum NativeSyscalls
     /** @brief Fork the current process
      * @fn int Fork()
      * This syscall is used to create a new process that is a copy of the current process.
-    */
+     */
     _Fork,
 
     /** @brief Wait for a process or a thread
@@ -267,7 +267,7 @@ static inline bool IsSyscallError(long ret)
 
 static inline long syscall0(long syscall)
 {
-    unsigned long ret;
+    long ret;
     __asm__ __volatile__("syscall"
                          : "=a"(ret)
                          : "a"(syscall)
@@ -277,7 +277,7 @@ static inline long syscall0(long syscall)
 
 static inline long syscall1(long syscall, long arg1)
 {
-    unsigned long ret;
+    long ret;
     __asm__ __volatile__("syscall"
                          : "=a"(ret)
                          : "a"(syscall), "D"(arg1)
@@ -287,7 +287,7 @@ static inline long syscall1(long syscall, long arg1)
 
 static inline long syscall2(long syscall, long arg1, long arg2)
 {
-    unsigned long ret;
+    long ret;
     __asm__ __volatile__("syscall"
                          : "=a"(ret)
                          : "a"(syscall), "D"(arg1), "S"(arg2)
@@ -297,7 +297,7 @@ static inline long syscall2(long syscall, long arg1, long arg2)
 
 static inline long syscall3(long syscall, long arg1, long arg2, long arg3)
 {
-    unsigned long ret;
+    long ret;
     __asm__ __volatile__("syscall"
                          : "=a"(ret)
                          : "a"(syscall), "D"(arg1), "S"(arg2), "d"(arg3)
@@ -307,7 +307,7 @@ static inline long syscall3(long syscall, long arg1, long arg2, long arg3)
 
 static inline long syscall4(long syscall, long arg1, long arg2, long arg3, long arg4)
 {
-    unsigned long ret;
+    long ret;
     register long r10 __asm__("r10") = arg4;
     __asm__ __volatile__("syscall"
                          : "=a"(ret)
@@ -318,7 +318,7 @@ static inline long syscall4(long syscall, long arg1, long arg2, long arg3, long
 
 static inline long syscall5(long syscall, long arg1, long arg2, long arg3, long arg4, long arg5)
 {
-    unsigned long ret;
+    long ret;
     register long r10 __asm__("r10") = arg4;
     register long r8 __asm__("r8") = arg5;
     __asm__ __volatile__("syscall"
@@ -330,7 +330,7 @@ static inline long syscall5(long syscall, long arg1, long arg2, long arg3, long
 
 static inline long syscall6(long syscall, long arg1, long arg2, long arg3, long arg4, long arg5, long arg6)
 {
-    unsigned long ret;
+    long ret;
     register long r10 __asm__("r10") = arg4;
     register long r8 __asm__("r8") = arg5;
     register long r9 __asm__("r9") = arg6;