diff --git a/spec/core_functions/color/hsl/error/four_args.hrx b/spec/core_functions/color/hsl/error/four_args.hrx
index 9f2eb3dc01..256e34b85d 100644
--- a/spec/core_functions/color/hsl/error/four_args.hrx
+++ b/spec/core_functions/color/hsl/error/four_args.hrx
@@ -56,7 +56,7 @@ a {
 }
 
 <===> alpha/unit/error
-Error: $alpha: Expected 0.5px to have no units or "%".
+Error: $alpha: Expected 0.5px to have unit "%" or no units.
   ,
 2 |   b: hsl(0, 0%, 0%, 0.5px);
   |      ^^^^^^^^^^^^^^^^^^^^^
diff --git a/spec/core_functions/color/hwb/error/four_args.hrx b/spec/core_functions/color/hwb/error/four_args.hrx
index 1e0ec96897..2813ed10c0 100644
--- a/spec/core_functions/color/hwb/error/four_args.hrx
+++ b/spec/core_functions/color/hwb/error/four_args.hrx
@@ -199,7 +199,7 @@ Error: $blackness: var(--c) is not a number.
 a {b: color.hwb(0, 0%, 0%, 0.5px)}
 
 <===> alpha/unit/error
-Error: $alpha: Expected 0.5px to have no units or "%".
+Error: $alpha: Expected 0.5px to have unit "%" or no units.
   ,
 2 | a {b: color.hwb(0, 0%, 0%, 0.5px)}
   |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/spec/core_functions/color/rgb/error/four_args.hrx b/spec/core_functions/color/rgb/error/four_args.hrx
index c099432eb9..b42ca4f30c 100644
--- a/spec/core_functions/color/rgb/error/four_args.hrx
+++ b/spec/core_functions/color/rgb/error/four_args.hrx
@@ -56,7 +56,7 @@ a {
 }
 
 <===> alpha/unit/error
-Error: $alpha: Expected 0.5px to have no units or "%".
+Error: $alpha: Expected 0.5px to have unit "%" or no units.
   ,
 2 |   b: rgb(0, 0, 0, 0.5px);
   |      ^^^^^^^^^^^^^^^^^^^
diff --git a/spec/core_functions/color/rgb/error/two_args.hrx b/spec/core_functions/color/rgb/error/two_args.hrx
index 7831095f68..675541945f 100644
--- a/spec/core_functions/color/rgb/error/two_args.hrx
+++ b/spec/core_functions/color/rgb/error/two_args.hrx
@@ -41,7 +41,7 @@ a {
 }
 
 <===> alpha/unit/error
-Error: $alpha: Expected 0.5px to have no units or "%".
+Error: $alpha: Expected 0.5px to have unit "%" or no units.
   ,
 2 |   b: rgb(#123, 0.5px);
   |      ^^^^^^^^^^^^^^^^