diff --git a/libvips/colour/profiles.c b/libvips/colour/profiles.c
index edc52080..8a4ca0c0 100644
--- a/libvips/colour/profiles.c
+++ b/libvips/colour/profiles.c
@@ -2,63 +2,6 @@
 
 #include "profiles.h"
 
-static VipsProfileFallback vips__profile_fallback_bt709 = {
-    "bt709",
-    596,
-    {
- 0x00, 0x00, 0x02, 0x54, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
- 0x6D, 0x6E, 0x74, 0x72, 0x52, 0x47, 0x42, 0x20, 0x58, 0x59, 0x5A, 0x20,
- 0x07, 0xDB, 0x00, 0x02, 0x00, 0x10, 0x00, 0x12, 0x00, 0x1D, 0x00, 0x21,
- 0x61, 0x63, 0x73, 0x70, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF6, 0xD6,
- 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0xD3, 0x2D, 0x00, 0x00, 0x00, 0x00,
- 0x6F, 0x72, 0x3A, 0x61, 0x57, 0x09, 0xAE, 0xA0, 0xE1, 0x65, 0x88, 0x4C,
- 0x20, 0x1D, 0x80, 0xE4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0B,
- 0x64, 0x65, 0x73, 0x63, 0x00, 0x00, 0x01, 0x08, 0x00, 0x00, 0x00, 0x79,
- 0x62, 0x58, 0x59, 0x5A, 0x00, 0x00, 0x01, 0x84, 0x00, 0x00, 0x00, 0x14,
- 0x62, 0x54, 0x52, 0x43, 0x00, 0x00, 0x01, 0x98, 0x00, 0x00, 0x00, 0x10,
- 0x67, 0x58, 0x59, 0x5A, 0x00, 0x00, 0x01, 0xA8, 0x00, 0x00, 0x00, 0x14,
- 0x67, 0x54, 0x52, 0x43, 0x00, 0x00, 0x01, 0x98, 0x00, 0x00, 0x00, 0x10,
- 0x72, 0x58, 0x59, 0x5A, 0x00, 0x00, 0x01, 0xBC, 0x00, 0x00, 0x00, 0x14,
- 0x72, 0x54, 0x52, 0x43, 0x00, 0x00, 0x01, 0x98, 0x00, 0x00, 0x00, 0x10,
- 0x74, 0x65, 0x63, 0x68, 0x00, 0x00, 0x01, 0xD0, 0x00, 0x00, 0x00, 0x0C,
- 0x77, 0x74, 0x70, 0x74, 0x00, 0x00, 0x01, 0xDC, 0x00, 0x00, 0x00, 0x14,
- 0x63, 0x70, 0x72, 0x74, 0x00, 0x00, 0x01, 0xF0, 0x00, 0x00, 0x00, 0x37,
- 0x63, 0x68, 0x61, 0x64, 0x00, 0x00, 0x02, 0x28, 0x00, 0x00, 0x00, 0x2C,
- 0x64, 0x65, 0x73, 0x63, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F,
- 0x49, 0x54, 0x55, 0x2D, 0x52, 0x20, 0x42, 0x54, 0x2E, 0x37, 0x30, 0x39,
- 0x20, 0x52, 0x65, 0x66, 0x65, 0x72, 0x65, 0x6E, 0x63, 0x65, 0x20, 0x44,
- 0x69, 0x73, 0x70, 0x6C, 0x61, 0x79, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x58, 0x59, 0x5A, 0x20, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x24, 0xA0, 0x00, 0x00, 0x0F, 0x84, 0x00, 0x00, 0xB6, 0xCF,
- 0x63, 0x75, 0x72, 0x76, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
- 0x02, 0x66, 0x00, 0x00, 0x58, 0x59, 0x5A, 0x20, 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x62, 0x99, 0x00, 0x00, 0xB7, 0x85, 0x00, 0x00, 0x18, 0xDA,
- 0x58, 0x59, 0x5A, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6F, 0xA2,
- 0x00, 0x00, 0x38, 0xF5, 0x00, 0x00, 0x03, 0x90, 0x73, 0x69, 0x67, 0x20,
- 0x00, 0x00, 0x00, 0x00, 0x43, 0x52, 0x54, 0x20, 0x58, 0x59, 0x5A, 0x20,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF6, 0xD6, 0x00, 0x01, 0x00, 0x00,
- 0x00, 0x00, 0xD3, 0x2D, 0x74, 0x65, 0x78, 0x74, 0x00, 0x00, 0x00, 0x00,
- 0x43, 0x6F, 0x70, 0x79, 0x72, 0x69, 0x67, 0x68, 0x74, 0x20, 0x49, 0x6E,
- 0x74, 0x65, 0x72, 0x6E, 0x61, 0x74, 0x69, 0x6F, 0x6E, 0x61, 0x6C, 0x20,
- 0x43, 0x6F, 0x6C, 0x6F, 0x72, 0x20, 0x43, 0x6F, 0x6E, 0x73, 0x6F, 0x72,
- 0x74, 0x69, 0x75, 0x6D, 0x2C, 0x20, 0x32, 0x30, 0x31, 0x31, 0x00, 0x00,
- 0x73, 0x66, 0x33, 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x0C, 0x44,
- 0x00, 0x00, 0x05, 0xDF, 0xFF, 0xFF, 0xF3, 0x26, 0x00, 0x00, 0x07, 0x94,
- 0x00, 0x00, 0xFD, 0x8F, 0xFF, 0xFF, 0xFB, 0xA1, 0xFF, 0xFF, 0xFD, 0xA2,
- 0x00, 0x00, 0x03, 0xDB, 0x00, 0x00, 0xC0, 0x75,
-    }
-};
-
 static VipsProfileFallback vips__profile_fallback_cmyk = {
     "cmyk",
     961644,
@@ -80788,7 +80731,6 @@ static VipsProfileFallback vips__profile_fallback_sRGB = {
 };
 
 VipsProfileFallback *vips__profile_fallback_table[] = {
-    &vips__profile_fallback_bt709,
     &vips__profile_fallback_cmyk,
     &vips__profile_fallback_sRGB,
     NULL
diff --git a/libvips/colour/profiles/Makefile.am b/libvips/colour/profiles/Makefile.am
index a53d0104..fc8f9734 100644
--- a/libvips/colour/profiles/Makefile.am
+++ b/libvips/colour/profiles/Makefile.am
@@ -1,4 +1,3 @@
 EXTRA_DIST = \
-	bt709.icm \
 	cmyk.icm \
 	sRGB.icm
diff --git a/libvips/colour/profiles/bt709.icm b/libvips/colour/profiles/bt709.icm
deleted file mode 100644
index 0b6669ff..00000000
Binary files a/libvips/colour/profiles/bt709.icm and /dev/null differ
diff --git a/libvips/foreign/heifload.c b/libvips/foreign/heifload.c
index 123778ad..258de9a4 100644
--- a/libvips/foreign/heifload.c
+++ b/libvips/foreign/heifload.c
@@ -493,17 +493,7 @@ vips_foreign_load_heif_set_header( VipsForeignLoadHeif *heif, VipsImage *out )
 			(VipsCallbackFn) NULL, data, length );
 	}
 	else if( profile_type == heif_color_profile_type_nclx ) {
-		/* nclx default coefficients are the same as bt709
-		 * FIXME .. apply any deltas to these defaults
-		 */
-		VipsBlob *blob;
-		size_t length;
-		const void *data;
-
-		vips_profile_load( "bt709", &blob, NULL );
-		data = vips_blob_get( blob, &length );
-		vips_image_set_blob( out, VIPS_META_ICC_NAME,
-			(VipsCallbackFn) NULL, data, length );
+		g_warning( "heifload: ignoring nclx profile" );
 	}
 #endif /*HAVE_HEIF_COLOR_PROFILE*/