diff --git a/reactos/ntoskrnl/mm/ARM3/miarm.h b/reactos/ntoskrnl/mm/ARM3/miarm.h
index 7b24a18062d..048b9f3e8a0 100644
--- a/reactos/ntoskrnl/mm/ARM3/miarm.h
+++ b/reactos/ntoskrnl/mm/ARM3/miarm.h
@@ -244,7 +244,7 @@ extern const ULONG MmProtectToValue[32];
 // Returns the color of a page
 //
 #define MI_GET_PAGE_COLOR(x)                ((x) & MmSecondaryColorMask)
-#define MI_GET_NEXT_COLOR(x)                (MI_GET_PAGE_COLOR(++MmSystemPageColor))
+#define MI_GET_NEXT_COLOR()                 (MI_GET_PAGE_COLOR(++MmSystemPageColor))
 #define MI_GET_NEXT_PROCESS_COLOR(x)        (MI_GET_PAGE_COLOR(++(x)->NextPageColor))
 
 #ifndef _M_AMD64
diff --git a/reactos/ntoskrnl/mm/ARM3/miavl.h b/reactos/ntoskrnl/mm/ARM3/miavl.h
index da698d6f70c..b16c84eea67 100644
--- a/reactos/ntoskrnl/mm/ARM3/miavl.h
+++ b/reactos/ntoskrnl/mm/ARM3/miavl.h
@@ -20,7 +20,7 @@
  *
  * The other difference is that the AVL package for Rtl has custom callbacks for
  * comparison purposes (which would access some internal, opaque, user data) while
- * the Mm package stores the user-data inline as StartingVpn and EndingVpn. So 
+ * the Mm package stores the user-data inline as StartingVpn and EndingVpn. So
  * when a compare is being made, RtlpAvlCompareRoutine is called, which will either
  * perform the Mm work, or call the user-specified callback in the Rtl case.
  */
@@ -54,7 +54,7 @@ RtlpAvlCompareRoutine(IN PRTL_AVL_TABLE Table,
     {
         return GenericEqual;
     }
-    else 
+    else
     {
         return GenericGreaterThan;
     }
@@ -80,7 +80,7 @@ SCHAR
 FORCEINLINE
 RtlBalance(IN PRTL_BALANCED_LINKS Node)
 {
-    return Node->u1.Balance;
+    return (SCHAR)Node->u1.Balance;
 }
 
 PRTL_BALANCED_LINKS
diff --git a/reactos/ntoskrnl/mm/ARM3/sysldr.c b/reactos/ntoskrnl/mm/ARM3/sysldr.c
index 87163cf222e..51d5cec2839 100644
--- a/reactos/ntoskrnl/mm/ARM3/sysldr.c
+++ b/reactos/ntoskrnl/mm/ARM3/sysldr.c
@@ -2086,7 +2086,7 @@ MiWriteProtectSystemImage(IN PVOID ImageBase)
     PIMAGE_NT_HEADERS NtHeaders;
     PIMAGE_SECTION_HEADER Section;
     PFN_NUMBER DriverPages;
-    ULONG CurrentProtection, SectionProtection, CombinedProtection, ProtectionMask;
+    ULONG CurrentProtection, SectionProtection, CombinedProtection = 0, ProtectionMask;
     ULONG Sections, Size;
     ULONG_PTR BaseAddress, CurrentAddress;
     PMMPTE PointerPte, StartPte, LastPte, CurrentPte, ComboPte = NULL;