diff --git a/src/pixie/images.nim b/src/pixie/images.nim
index b6b1072..6ad979c 100644
--- a/src/pixie/images.nim
+++ b/src/pixie/images.nim
@@ -1,4 +1,4 @@
-import blends, bumpy, chroma, common, masks, pixie/internal, system/memory, vmath
+import blends, bumpy, chroma, common, masks, pixie/internal, vmath
 
 when defined(amd64) and not defined(pixieNoSimd):
   import nimsimd/sse2
@@ -96,39 +96,6 @@ proc setColor*(image: Image, x, y: int, color: Color) {.inline, raises: [].} =
   ## Sets a color at (x, y) or does nothing if outside of bounds.
   image[x, y] = color.rgbx()
 
-proc fillUnsafe*(
-  data: var seq[ColorRGBX], color: SomeColor, start, len: int
-) {.raises: [].} =
-  ## Fills the image data with the color starting at index start and
-  ## continuing for len indices.
-
-  let rgbx = color.asRgbx()
-
-  # Use memset when every byte has the same value
-  if rgbx.r == rgbx.g and rgbx.r == rgbx.b and rgbx.r == rgbx.a:
-    nimSetMem(data[start].addr, rgbx.r.cint, len * 4)
-  else:
-    var i = start
-    when defined(amd64) and not defined(pixieNoSimd):
-      # When supported, SIMD fill until we run out of room
-      let colorVec = mm_set1_epi32(cast[int32](rgbx))
-      for _ in 0 ..< len div 8:
-        mm_storeu_si128(data[i + 0].addr, colorVec)
-        mm_storeu_si128(data[i + 4].addr, colorVec)
-        i += 8
-    else:
-      when sizeof(int) == 8:
-        # Fill 8 bytes at a time when possible
-        let
-          u32 = cast[uint32](rgbx)
-          u64 = cast[uint64]([u32, u32])
-        for _ in 0 ..< len div 2:
-          cast[ptr uint64](data[i].addr)[] = u64
-          i += 2
-    # Fill whatever is left the slow way
-    for j in i ..< start + len:
-      data[j] = rgbx
-
 proc fill*(image: Image, color: SomeColor) {.inline, raises: [].} =
   ## Fills the image with the color.
   fillUnsafe(image.data, color, 0, image.data.len)
diff --git a/src/pixie/internal.nim b/src/pixie/internal.nim
index bff9dfb..669899e 100644
--- a/src/pixie/internal.nim
+++ b/src/pixie/internal.nim
@@ -1,4 +1,4 @@
-import chroma, vmath
+import chroma, system/memory, vmath
 
 when defined(amd64) and not defined(pixieNoSimd):
   import nimsimd/sse2
@@ -39,6 +39,46 @@ proc `*`*(color: ColorRGBX, opacity: float32): ColorRGBX {.raises: [].} =
       a = ((color.a * x) div 255).uint8
     rgbx(r, g, b, a)
 
+proc fillUnsafe*(
+  data: var seq[uint8], value: uint8, start, len: int
+) {.raises: [].} =
+  ## Fills the mask data with the value starting at index start and
+  ## continuing for len indices.
+  nimSetMem(data[start].addr, value.cint, len)
+
+proc fillUnsafe*(
+  data: var seq[ColorRGBX], color: SomeColor, start, len: int
+) {.raises: [].} =
+  ## Fills the image data with the color starting at index start and
+  ## continuing for len indices.
+
+  let rgbx = color.asRgbx()
+
+  # Use memset when every byte has the same value
+  if rgbx.r == rgbx.g and rgbx.r == rgbx.b and rgbx.r == rgbx.a:
+    nimSetMem(data[start].addr, rgbx.r.cint, len * 4)
+  else:
+    var i = start
+    when defined(amd64) and not defined(pixieNoSimd):
+      # When supported, SIMD fill until we run out of room
+      let colorVec = mm_set1_epi32(cast[int32](rgbx))
+      for _ in 0 ..< len div 8:
+        mm_storeu_si128(data[i + 0].addr, colorVec)
+        mm_storeu_si128(data[i + 4].addr, colorVec)
+        i += 8
+    else:
+      when sizeof(int) == 8:
+        # Fill 8 bytes at a time when possible
+        let
+          u32 = cast[uint32](rgbx)
+          u64 = cast[uint64]([u32, u32])
+        for _ in 0 ..< len div 2:
+          cast[ptr uint64](data[i].addr)[] = u64
+          i += 2
+    # Fill whatever is left the slow way
+    for j in i ..< start + len:
+      data[j] = rgbx
+
 proc toStraightAlpha*(data: var seq[ColorRGBA | ColorRGBX]) {.raises: [].} =
   ## Converts an image from premultiplied alpha to straight alpha.
   ## This is expensive for large images.
diff --git a/src/pixie/masks.nim b/src/pixie/masks.nim
index 7643a21..ea7b718 100644
--- a/src/pixie/masks.nim
+++ b/src/pixie/masks.nim
@@ -1,4 +1,4 @@
-import common, internal, system/memory, vmath
+import common, internal, vmath
 
 when defined(amd64) and not defined(pixieNoSimd):
   import nimsimd/sse2
@@ -202,13 +202,6 @@ proc magnifyBy2*(mask: Mask, power = 1): Mask {.raises: [PixieError].} =
         result.width * 4
       )
 
-proc fillUnsafe*(
-  data: var seq[uint8], value: uint8, start, len: int
-) {.raises: [].} =
-  ## Fills the mask data with the value starting at index start and
-  ## continuing for len indices.
-  nimSetMem(data[start].addr, value.cint, len)
-
 proc fill*(mask: Mask, value: uint8) {.inline, raises: [].} =
   ## Fills the mask with the value.
   fillUnsafe(mask.data, value, 0, mask.data.len)