diff --git a/Tests/test_lib_pack.py b/Tests/test_lib_pack.py
index f7812f62bd8..963d35b067e 100644
--- a/Tests/test_lib_pack.py
+++ b/Tests/test_lib_pack.py
@@ -340,6 +340,10 @@ def test_RGB(self):
             self.assert_unpack("RGB", "G;16N", 2, (0, 1, 0), (0, 3, 0), (0, 5, 0))
             self.assert_unpack("RGB", "B;16N", 2, (0, 0, 1), (0, 0, 3), (0, 0, 5))
 
+        self.assert_unpack(
+            "RGB", "CMYK", 4, (250, 249, 248), (242, 241, 240), (234, 233, 233)
+        )
+
     def test_RGBA(self):
         self.assert_unpack("RGBA", "LA", 2, (1, 1, 1, 2), (3, 3, 3, 4), (5, 5, 5, 6))
         self.assert_unpack(
diff --git a/src/libImaging/Convert.c b/src/libImaging/Convert.c
index 7677a81f72f..b08519d3045 100644
--- a/src/libImaging/Convert.c
+++ b/src/libImaging/Convert.c
@@ -564,7 +564,7 @@ rgb2cmyk(UINT8 *out, const UINT8 *in, int xsize) {
     }
 }
 
-static void
+void
 cmyk2rgb(UINT8 *out, const UINT8 *in, int xsize) {
     int x, nk, tmp;
     for (x = 0; x < xsize; x++) {
diff --git a/src/libImaging/Convert.h b/src/libImaging/Convert.h
new file mode 100644
index 00000000000..e688e301836
--- /dev/null
+++ b/src/libImaging/Convert.h
@@ -0,0 +1,2 @@
+extern void
+cmyk2rgb(UINT8 *out, const UINT8 *in, int xsize);
diff --git a/src/libImaging/Unpack.c b/src/libImaging/Unpack.c
index 206403ba6e0..bef4bea6642 100644
--- a/src/libImaging/Unpack.c
+++ b/src/libImaging/Unpack.c
@@ -31,6 +31,7 @@
  */
 
 #include "Imaging.h"
+#include "Convert.h"
 
 #define R 0
 #define G 1
@@ -1589,6 +1590,7 @@ static struct {
     {"RGB", "R;16B", 16, band016B},
     {"RGB", "G;16B", 16, band116B},
     {"RGB", "B;16B", 16, band216B},
+    {"RGB", "CMYK", 32, cmyk2rgb},
 
     /* true colour w. alpha */
     {"RGBA", "LA", 16, unpackRGBALA},