diff --git a/packages/tailwindcss-language-service/src/completionProvider.ts b/packages/tailwindcss-language-service/src/completionProvider.ts
index f11cab0..490a2eb 100644
--- a/packages/tailwindcss-language-service/src/completionProvider.ts
+++ b/packages/tailwindcss-language-service/src/completionProvider.ts
@@ -159,7 +159,7 @@ function provideClassAttributeCompletions(
     end: position,
   })
 
-  const match = findLast(/(?:\b|:)class(?:Name)?=['"`{]/gi, str)
+  const match = findLast(/(?:\s|:)class(?:Name)?=['"`{]/gi, str)
 
   if (match === null) {
     return null
diff --git a/packages/tailwindcss-language-service/src/util/find.ts b/packages/tailwindcss-language-service/src/util/find.ts
index 60fa9e8..e80dfb2 100644
--- a/packages/tailwindcss-language-service/src/util/find.ts
+++ b/packages/tailwindcss-language-service/src/util/find.ts
@@ -135,7 +135,7 @@ export function findClassListsInHtmlRange(
   range?: Range
 ): DocumentClassList[] {
   const text = doc.getText(range)
-  const matches = findAll(/(?:\b|:)class(?:Name)?=['"`{]/g, text)
+  const matches = findAll(/(?:\s|:)class(?:Name)?=['"`{]/g, text)
   const result: DocumentClassList[] = []
 
   matches.forEach((match) => {