diff --git a/.changeset/tasty-goats-crash.md b/.changeset/tasty-goats-crash.md
new file mode 100644
index 000000000..dcfafff57
--- /dev/null
+++ b/.changeset/tasty-goats-crash.md
@@ -0,0 +1,5 @@
+---
+'@emotion/styled': patch
+---
+
+Fix `props.theme` type in styled component interpolation being optional (`Theme | undefined`) for components without `AdditionalProps` being specified.
diff --git a/packages/styled/types/base.d.ts b/packages/styled/types/base.d.ts
index ec158e806..51ece5732 100644
--- a/packages/styled/types/base.d.ts
+++ b/packages/styled/types/base.d.ts
@@ -68,7 +68,9 @@ export interface CreateStyledComponent<
 
   (
     template: TemplateStringsArray,
-    ...styles: Array<Interpolation<ComponentProps & SpecificComponentProps>>
+    ...styles: Array<
+      Interpolation<ComponentProps & SpecificComponentProps & { theme: Theme }>
+    >
   ): StyledComponent<ComponentProps, SpecificComponentProps>
 
   /**
diff --git a/packages/styled/types/tests.tsx b/packages/styled/types/tests.tsx
index 1a10a715f..e3f13c99c 100644
--- a/packages/styled/types/tests.tsx
+++ b/packages/styled/types/tests.tsx
@@ -112,6 +112,9 @@ const Input4 = styled.input<AdditionalTest>`
   marginLeft: props.left
 })}
 `
+const Input5 = styled.input`
+  color: ${props => props.theme.primary};
+`
 ;<Input
   onChange={(evt: React.ChangeEvent<HTMLInputElement>) =>
     console.log(evt.target.value)