diff --git a/reactos/include/psdk/ntdef.h b/reactos/include/psdk/ntdef.h
index dd61c17b802..d5539b5cf87 100644
--- a/reactos/include/psdk/ntdef.h
+++ b/reactos/include/psdk/ntdef.h
@@ -130,6 +130,6 @@ typedef LIST_ENTRY64 *PLIST_ENTRY64;
 #define MAXUSHORT 0xffff
 #define MAXULONG  0xffffffff
 #define MAXLONGLONG (0x7fffffffffffffffLL)
-#define C_ASSERT(e) extern char __C_ASSERT__[(e)?1:-1]
+#define C_ASSERT(e) typedef __C_ASSERT__ char[(e)?1:-1]
 
 #endif /* _NTDEF_H */
diff --git a/reactos/ntoskrnl/mm/pe.c b/reactos/ntoskrnl/mm/pe.c
index 7c9590ad8ca..7e0465f9837 100644
--- a/reactos/ntoskrnl/mm/pe.c
+++ b/reactos/ntoskrnl/mm/pe.c
@@ -178,7 +178,7 @@ NTSTATUS NTAPI PeFmtCreateSection(IN CONST VOID * FileHeader,
 
     ASSERT(Intsafe_CanOffsetPointer(FileHeader, FileHeaderSize));
 
-    ASSERT(EXEFMT_LOAD_HEADER_SIZE >= sizeof(IMAGE_DOS_HEADER));
+    C_ASSERT(EXEFMT_LOAD_HEADER_SIZE >= sizeof(IMAGE_DOS_HEADER));
     ASSERT(((UINT_PTR)FileHeader % TYPE_ALIGNMENT(IMAGE_DOS_HEADER)) == 0);
 
 #define DIE(ARGS_) { DPRINT ARGS_; goto l_Return; }
@@ -219,10 +219,10 @@ NTSTATUS NTAPI PeFmtCreateSection(IN CONST VOID * FileHeader,
 	pinhNtHeader = (PVOID)((UINT_PTR)FileHeader + pidhDosHeader->e_lfanew);
     }
 
-    ASSERT(sizeof(IMAGE_NT_HEADERS32) <= sizeof(IMAGE_NT_HEADERS64));
-    ASSERT(TYPE_ALIGNMENT(IMAGE_NT_HEADERS32) == TYPE_ALIGNMENT(IMAGE_NT_HEADERS64));
-    ASSERT(RTL_SIZEOF_THROUGH_FIELD(IMAGE_NT_HEADERS32, FileHeader) == RTL_SIZEOF_THROUGH_FIELD(IMAGE_NT_HEADERS64, FileHeader));
-    ASSERT(FIELD_OFFSET(IMAGE_NT_HEADERS32, OptionalHeader) == FIELD_OFFSET(IMAGE_NT_HEADERS64, OptionalHeader));
+    C_ASSERT(sizeof(IMAGE_NT_HEADERS32) <= sizeof(IMAGE_NT_HEADERS64));
+    C_ASSERT(TYPE_ALIGNMENT(IMAGE_NT_HEADERS32) == TYPE_ALIGNMENT(IMAGE_NT_HEADERS64));
+    C_ASSERT(RTL_SIZEOF_THROUGH_FIELD(IMAGE_NT_HEADERS32, FileHeader) == RTL_SIZEOF_THROUGH_FIELD(IMAGE_NT_HEADERS64, FileHeader));
+    C_ASSERT(FIELD_OFFSET(IMAGE_NT_HEADERS32, OptionalHeader) == FIELD_OFFSET(IMAGE_NT_HEADERS64, OptionalHeader));
 
     /*
      * the buffer doesn't contain the NT file header, or the alignment is wrong: we
@@ -307,7 +307,7 @@ l_ReadHeaderFromFile:
 
     nStatus = STATUS_INVALID_IMAGE_FORMAT;
 
-    ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, Magic));
+    C_ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, Magic));
 
     if(!RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, Magic))
 	DIE(("The optional header doesn't contain the Magic field, SizeOfOptionalHeader is %X\n", cbOptHeaderSize));
@@ -324,8 +324,8 @@ l_ReadHeaderFromFile:
 	    DIE(("Unrecognized optional header, Magic is %X\n", piohOptHeader->Magic));
     }
 
-    ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SectionAlignment));
-    ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, FileAlignment));
+    C_ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SectionAlignment));
+    C_ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, FileAlignment));
 
     if (RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, SectionAlignment) &&
         RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, FileAlignment))
@@ -410,9 +410,9 @@ l_ReadHeaderFromFile:
     if((ULONG_PTR)ImageSectionObject->ImageBase % 0x10000)
 	DIE(("ImageBase is not aligned on a 64KB boundary"));
 
-    ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, Subsystem));
-    ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, MinorSubsystemVersion));
-    ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, MajorSubsystemVersion));
+    C_ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, Subsystem));
+    C_ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, MinorSubsystemVersion));
+    C_ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, MajorSubsystemVersion));
 
     if(RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, Subsystem))
     {
@@ -426,7 +426,7 @@ l_ReadHeaderFromFile:
 	}
     }
 
-    ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, AddressOfEntryPoint));
+    C_ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, AddressOfEntryPoint));
 
     if(RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, AddressOfEntryPoint))
     {
@@ -434,7 +434,7 @@ l_ReadHeaderFromFile:
                                          piohOptHeader->AddressOfEntryPoint;
     }
 
-    ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SizeOfCode));
+    C_ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SizeOfCode));
 
     if(RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, SizeOfCode))
 	ImageSectionObject->Executable = piohOptHeader->SizeOfCode != 0;
@@ -472,7 +472,7 @@ l_ReadHeaderFromFile:
     if(!Intsafe_AddULong32(&cbSectionHeadersOffsetSize, cbSectionHeadersOffset, cbSectionHeadersSize))
 	DIE(("Section headers too large\n"));
 
-    ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SizeOfHeaders));
+    C_ASSERT(PEFMT_FIELDS_EQUAL(IMAGE_OPTIONAL_HEADER32, IMAGE_OPTIONAL_HEADER64, SizeOfHeaders));
 
     /* size of the executable's headers */
     if(RTL_CONTAINS_FIELD(piohOptHeader, cbOptHeaderSize, SizeOfHeaders))