diff --git a/core/mem/allocators.odin b/core/mem/allocators.odin
index fc009621b..66da12959 100644
--- a/core/mem/allocators.odin
+++ b/core/mem/allocators.odin
@@ -153,7 +153,7 @@ scratch_allocator_proc :: proc(allocator_data: rawptr, mode: Allocator_Mode,
 	s := (^Scratch_Allocator)(allocator_data)
 
 	if s.data == nil {
-		DEFAULT_BACKING_SIZE :: 1<<22
+		DEFAULT_BACKING_SIZE :: 4 * Megabyte
 		if !(context.allocator.procedure != scratch_allocator_proc &&
 		     context.allocator.data != allocator_data) {
 			panic("cyclic initialization of the scratch allocator with itself")
diff --git a/core/mem/mem.odin b/core/mem/mem.odin
index f7be69adc..bc77ca287 100644
--- a/core/mem/mem.odin
+++ b/core/mem/mem.odin
@@ -3,11 +3,11 @@ package mem
 import "core:runtime"
 import "core:intrinsics"
 
-Byte     :: 1
-Kilobyte :: 1024 * Byte
-Megabyte :: 1024 * Kilobyte
-Gigabyte :: 1024 * Megabyte
-Terabyte :: 1024 * Gigabyte
+Byte     :: runtime.Byte
+Kilobyte :: runtime.Kilobyte
+Megabyte :: runtime.Megabyte
+Gigabyte :: runtime.Gigabyte
+Terabyte :: runtime.Terabyte
 
 set :: proc "contextless" (data: rawptr, value: byte, len: int) -> rawptr {
 	return runtime.memset(data, i32(value), len)
diff --git a/core/mem/virtual/arena.odin b/core/mem/virtual/arena.odin
index e901cf6f3..0ddb116fd 100644
--- a/core/mem/virtual/arena.odin
+++ b/core/mem/virtual/arena.odin
@@ -19,11 +19,11 @@ Arena :: struct {
 
 
 // 1 MiB should be enough to start with
-DEFAULT_ARENA_STATIC_COMMIT_SIZE         :: 1<<20
+DEFAULT_ARENA_STATIC_COMMIT_SIZE         :: mem.Megabyte
 DEFAULT_ARENA_GROWING_MINIMUM_BLOCK_SIZE :: DEFAULT_ARENA_STATIC_COMMIT_SIZE
 
 // 1 GiB on 64-bit systems, 128 MiB on 32-bit systems by default
-DEFAULT_ARENA_STATIC_RESERVE_SIZE :: 1<<30 when size_of(uintptr) == 8 else 1<<27
+DEFAULT_ARENA_STATIC_RESERVE_SIZE :: mem.Gigabyte when size_of(uintptr) == 8 else 128 * mem.Megabyte
 
 
 
diff --git a/core/runtime/core.odin b/core/runtime/core.odin
index 108609f78..a74bf4285 100644
--- a/core/runtime/core.odin
+++ b/core/runtime/core.odin
@@ -329,6 +329,12 @@ Allocator :: struct {
 	data:      rawptr,
 }
 
+Byte     :: 1
+Kilobyte :: 1024 * Byte
+Megabyte :: 1024 * Kilobyte
+Gigabyte :: 1024 * Megabyte
+Terabyte :: 1024 * Gigabyte
+
 // Logging stuff
 
 Logger_Level :: enum uint {
diff --git a/core/runtime/default_temporary_allocator.odin b/core/runtime/default_temporary_allocator.odin
index 176634ff9..b71cd103a 100644
--- a/core/runtime/default_temporary_allocator.odin
+++ b/core/runtime/default_temporary_allocator.odin
@@ -1,6 +1,6 @@
 package runtime
 
-DEFAULT_TEMP_ALLOCATOR_BACKING_SIZE: int : #config(DEFAULT_TEMP_ALLOCATOR_BACKING_SIZE, 1<<22)
+DEFAULT_TEMP_ALLOCATOR_BACKING_SIZE: int : #config(DEFAULT_TEMP_ALLOCATOR_BACKING_SIZE, 4 * Megabyte)
 
 
 when ODIN_OS == .Freestanding || ODIN_OS == .JS || ODIN_DEFAULT_TO_NIL_ALLOCATOR {
@@ -197,4 +197,4 @@ default_temp_allocator :: proc(allocator: ^Default_Temp_Allocator) -> Allocator
 		procedure = default_temp_allocator_proc,
 		data = allocator,
 	}
-}
\ No newline at end of file
+}