diff --git a/lib/src/jpegrutils.cpp b/lib/src/jpegrutils.cpp
index 3f064ade..a1b0ac86 100644
--- a/lib/src/jpegrutils.cpp
+++ b/lib/src/jpegrutils.cpp
@@ -729,6 +729,9 @@ uhdr_error_info_t getMetadataFromXMP(uint8_t* xmp_data, size_t xmp_size, uint8_t
       metadata->offset_hdr[c] = 0.0f;
     }
     metadata->hdr_capacity_min = 1.0f;
+    // Apple applies the gain map in the base image's color space, and its gain-map
+    // image carries no ICC profile.
+    metadata->use_base_cg = true;
 
     float max_content_boost;
     bool present = false;
diff --git a/tests/jpegr_test.cpp b/tests/jpegr_test.cpp
index 8748dac1..019c0b85 100644
--- a/tests/jpegr_test.cpp
+++ b/tests/jpegr_test.cpp
@@ -1753,6 +1753,7 @@ TEST(JpegRTest, decodeApple) {
     }
     EXPECT_EQ(gainmapMetadata->hdr_capacity_min, 1.0f);
     EXPECT_FLOAT_EQ(gainmapMetadata->hdr_capacity_max, headroom);
+    EXPECT_TRUE(gainmapMetadata->use_base_cg);
 
     uhdr_release_decoder(dec);
   }