diff --git a/autotests/read/psd/cmyka-16bits.png b/autotests/read/psd/cmyka-16bits.png
new file mode 100644
index 0000000..70bf860
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diff --git a/autotests/read/psd/cmyka-16bits.psd b/autotests/read/psd/cmyka-16bits.psd
new file mode 100644
index 0000000..714c967
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diff --git a/autotests/read/psd/cmyka-8bits.png b/autotests/read/psd/cmyka-8bits.png
new file mode 100644
index 0000000..b296502
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diff --git a/autotests/read/psd/cmyka-8bits.psd b/autotests/read/psd/cmyka-8bits.psd
new file mode 100644
index 0000000..00cb5b1
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diff --git a/src/imageformats/psd.cpp b/src/imageformats/psd.cpp
index 996f7d6..6dfc630 100644
--- a/src/imageformats/psd.cpp
+++ b/src/imageformats/psd.cpp
@@ -667,9 +667,10 @@ inline void cmykToRgb(uchar *target, qint32 targetChannels, const char *source,
         *(t + pt + 1) = T(std::min(max - (M * (1 - K) + K) * max + 0.5, max));
         *(t + pt + 2) = T(std::min(max - (Y * (1 - K) + K) * max + 0.5, max));
         if (targetChannels == 4) {
-            *(t + pt + 3) = std::numeric_limits<T>::max();
             if (sourceChannels == 5)
-                *(t + pt + 3) -= *(s + ps + 4);
+                *(t + pt + 3) = *(s + ps + 4);
+            else
+                *(t + pt + 3) = std::numeric_limits<T>::max();
         }
     }
 }