diff --git a/gdk/gdkmemoryformat.c b/gdk/gdkmemoryformat.c
index ce8ea268a4..c567d763b4 100644
--- a/gdk/gdkmemoryformat.c
+++ b/gdk/gdkmemoryformat.c
@@ -481,7 +481,7 @@ static const GdkMemoryFormatDescription memory_formats[] = {
     G_ALIGNOF (guchar),
     GDK_MEMORY_U8,
     { 0, 0, 0, 0 },
-    { GL_RGB8, GL_RGB, GL_UNSIGNED_BYTE, { GL_RED, GL_GREEN, GL_BLUE, GL_ONE } },
+    { GL_RGB8, GL_RGB, GL_UNSIGNED_BYTE, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
     r8g8b8_to_float,
     r8g8b8_from_float,
   },
@@ -491,7 +491,7 @@ static const GdkMemoryFormatDescription memory_formats[] = {
     G_ALIGNOF (guchar),
     GDK_MEMORY_U8,
     { 0, 0, G_MAXUINT, G_MAXUINT },
-    { GL_RGB8, GL_BGR, GL_UNSIGNED_BYTE, { GL_RED, GL_GREEN, GL_BLUE, GL_ONE } },
+    { GL_RGB8, GL_BGR, GL_UNSIGNED_BYTE, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
     b8g8r8_to_float,
     b8g8r8_from_float,
   },
@@ -501,7 +501,7 @@ static const GdkMemoryFormatDescription memory_formats[] = {
     G_ALIGNOF (guint16),
     GDK_MEMORY_U16,
     { 0, 0, 3, 0 },
-    { GL_RGB16, GL_RGB, GL_UNSIGNED_SHORT, { GL_RED, GL_GREEN, GL_BLUE, GL_ONE } },
+    { GL_RGB16, GL_RGB, GL_UNSIGNED_SHORT, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
     r16g16b16_to_float,
     r16g16b16_from_float,
   },
@@ -531,7 +531,7 @@ static const GdkMemoryFormatDescription memory_formats[] = {
     G_ALIGNOF (guint16),
     GDK_MEMORY_FLOAT16,
     { 0, 0, 3, 0 },
-    { GL_RGB16F, GL_RGB, GL_HALF_FLOAT, { GL_RED, GL_GREEN, GL_BLUE, GL_ONE } },
+    { GL_RGB16F, GL_RGB, GL_HALF_FLOAT, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
     r16g16b16_float_to_float,
     r16g16b16_float_from_float,
   },
@@ -561,7 +561,7 @@ static const GdkMemoryFormatDescription memory_formats[] = {
     G_ALIGNOF (float),
     GDK_MEMORY_FLOAT32,
     { 0, 0, 3, 0 },
-    { GL_RGB32F, GL_RGB, GL_FLOAT, { GL_RED, GL_GREEN, GL_BLUE, GL_ONE } },
+    { GL_RGB32F, GL_RGB, GL_FLOAT, { GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA } },
     r32g32b32_float_to_float,
     r32g32b32_float_from_float,
   },
diff --git a/gsk/gl/gskglcommandqueue.c b/gsk/gl/gskglcommandqueue.c
index b1db146785..4b5621623f 100644
--- a/gsk/gl/gskglcommandqueue.c
+++ b/gsk/gl/gskglcommandqueue.c
@@ -1619,7 +1619,7 @@ gsk_gl_command_queue_do_upload_texture_chunk (GskGLCommandQueue *self,
   /* Only apply swizzle if really needed, might not even be
    * supported if default values are set
    */
-  if (gl_swizzle[0] != GL_RED || gl_swizzle[1] != GL_GREEN || gl_swizzle[2] != GL_BLUE)
+  if (gl_swizzle[0] != GL_RED || gl_swizzle[1] != GL_GREEN || gl_swizzle[2] != GL_BLUE || gl_swizzle[3] != GL_ALPHA)
     {
       /* Set each channel independently since GLES 3.0 doesn't support the iv method */
       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_R, gl_swizzle[0]);