diff --git a/libvips/colour/profile_load.c b/libvips/colour/profile_load.c
index 9f9016c7..083e56d5 100644
--- a/libvips/colour/profile_load.c
+++ b/libvips/colour/profile_load.c
@@ -58,58 +58,19 @@ typedef VipsOperationClass VipsProfileLoadClass;
 
 G_DEFINE_TYPE( VipsProfileLoad, vips_profile_load, VIPS_TYPE_OPERATION );
 
-/* Created on first use from a base64 string in profiles.c.
- */
-typedef struct _VipsFallbackProfile {
-	const char *name;
-	void *data;
-	size_t data_length;
-} VipsFallbackProfile;
-
-static GSList *vips_fallback_profile_list = NULL;
-
-static void *
-vips_fallback_profile_get_init( void )
+static const void *
+vips_profile_fallback_get( const char *name, size_t *length )
 {
 	int i;
+	VipsProfileFallback *fallback;
 
-	for( i = 0; vips__coded_profiles[i].name; i++ ) {
-		size_t data_length;
-		unsigned char *data;
-		VipsFallbackProfile *fallback;
-
-		if( !(data = vips__b64_decode( 
-			vips__coded_profiles[i].data, &data_length )) )
-			return( NULL );
-		fallback = g_new( VipsFallbackProfile,1 );
-		fallback->name = vips__coded_profiles[i].name;
-		fallback->data = data;
-		fallback->data_length = data_length;
-		vips_fallback_profile_list = g_slist_prepend( 
-			vips_fallback_profile_list, fallback );
-	}
-
-	return( NULL );
-}
-
-static void *
-vips_fallback_profile_get( const char *name, size_t *length )
-{
-	static GOnce once = G_ONCE_INIT;
-
-	GSList *p;
-
-	VIPS_ONCE( &once, (GThreadFunc) vips_fallback_profile_get_init, NULL );
-
-	for( p = vips_fallback_profile_list; p; p = p->next ) {
-		VipsFallbackProfile *fallback = (VipsFallbackProfile *) p->data;
-
+	for( i = 0; (fallback = vips__profile_fallback_table[i]); i++ ) 
 		if( g_ascii_strcasecmp( fallback->name, name ) == 0 ) {
-			*length = fallback->data_length;
+			if( length )
+				*length = fallback->length;
 
 			return( fallback->data );
 		}
-	}
 
 	return( NULL );
 }
@@ -131,7 +92,7 @@ vips_profile_load_build( VipsObject *object )
 	if( g_ascii_strcasecmp( load->name, "none" ) == 0 ) {
 		profile = NULL;
 	}
-	else if( (data = vips_fallback_profile_get( load->name, &length )) ) {
+	else if( (data = vips_profile_fallback_get( load->name, &length )) ) {
 		profile = vips_blob_new( NULL, data, length );
 	}
 	else if( (data = vips__file_read_name( load->name, 
diff --git a/libvips/colour/profiles.c b/libvips/colour/profiles.c
index 5c373dbb..8a4ca0c0 100644
--- a/libvips/colour/profiles.c
+++ b/libvips/colour/profiles.c
@@ -2,7 +2,7 @@
 
 #include "profiles.h"
 
-static VipsCodedProfile vips__profile_cmyk = {
+static VipsProfileFallback vips__profile_fallback_cmyk = {
     "cmyk",
     961644,
     {
@@ -80146,7 +80146,7 @@ static VipsCodedProfile vips__profile_cmyk = {
     }
 };
 
-static VipsCodedProfile vips__profile_sRGB = {
+static VipsProfileFallback vips__profile_fallback_sRGB = {
     "sRGB",
     6922,
     {
@@ -80730,8 +80730,8 @@ static VipsCodedProfile vips__profile_sRGB = {
     }
 };
 
-VipsCodedProfile *vips__coded_profiles[] = {
-    &vips__profile_cmyk,
-    &vips__profile_sRGB,
+VipsProfileFallback *vips__profile_fallback_table[] = {
+    &vips__profile_fallback_cmyk,
+    &vips__profile_fallback_sRGB,
     NULL
 };
diff --git a/libvips/colour/profiles.h b/libvips/colour/profiles.h
index 0f907578..142e4f83 100644
--- a/libvips/colour/profiles.h
+++ b/libvips/colour/profiles.h
@@ -1,11 +1,13 @@
-/* The fallback profiles, coded as a set of base64 strings, see 
- * wrap-profiles.sh
+/* The fallback profiles, coded as a set of uchar arrays, see wrap-profiles.sh
  */
-typedef struct _VipsCodedProfile {
+
+#include <stddef.h>
+
+typedef struct _VipsProfileFallback {
 	const char *name;
-	int length;
+	size_t length;
 	const unsigned char data[];
-} VipsCodedProfile;
+} VipsProfileFallback;
 
-extern VipsCodedProfile *vips__coded_profiles[];
+extern VipsProfileFallback *vips__profile_fallback_table[];
 
diff --git a/libvips/colour/wrap-profiles.sh b/libvips/colour/wrap-profiles.sh
index 6a506a53..c7b5431e 100755
--- a/libvips/colour/wrap-profiles.sh
+++ b/libvips/colour/wrap-profiles.sh
@@ -18,9 +18,9 @@ profile_names=
 for file in $in/*; do 
   root=${file%.icm}
   base=${root##*/} 
-  profile_name=vips__profile_$base
+  profile_name=vips__profile_fallback_$base
   profile_names="$profile_names $profile_name"
-  echo "static VipsCodedProfile $profile_name = {" >> $out
+  echo "static VipsProfileFallback $profile_name = {" >> $out
   echo "    \"$base\"," >> $out
   echo "    $(stat --format=%s $file)," >> $out
   echo "    {" >> $out
@@ -30,7 +30,7 @@ for file in $in/*; do
   echo  >> $out
 done
 
-echo "VipsCodedProfile *vips__coded_profiles[] = {" >> $out
+echo "VipsProfileFallback *vips__profile_fallback_table[] = {" >> $out
 for profile_name in $profile_names; do
   echo "    &$profile_name," >> $out
 done
diff --git a/test/test-suite/test_foreign.py b/test/test-suite/test_foreign.py
index 5e13f0b3..4d8501b6 100644
--- a/test/test-suite/test_foreign.py
+++ b/test/test-suite/test_foreign.py
@@ -461,7 +461,9 @@ class TestForeign:
     def test_webp(self):
         def webp_valid(im):
             a = im(10, 10)
-            assert_almost_equal_objects(a, [71, 166, 236])
+            # different webp versions use different rounding systems leading
+            # to small variations
+            assert_almost_equal_objects(a, [71, 166, 236], threshold=2)
             assert im.width == 550
             assert im.height == 368
             assert im.bands == 3
@@ -476,7 +478,7 @@ class TestForeign:
         im = pyvips.Image.new_from_file(WEBP_FILE)
         buf = im.webpsave_buffer(lossless=True)
         im2 = pyvips.Image.new_from_buffer(buf, "")
-        assert im.avg() == im2.avg()
+        assert abs(im.avg() - im2.avg()) < 1
 
         # higher Q should mean a bigger buffer
         b1 = im.webpsave_buffer(Q=10)