diff --git a/src/Deprecated80/FFICalloutMethodBuilder.extension.st b/src/Deprecated80/FFICalloutMethodBuilder.extension.st
new file mode 100644
index 00000000000..ddda4f5694a
--- /dev/null
+++ b/src/Deprecated80/FFICalloutMethodBuilder.extension.st
@@ -0,0 +1,10 @@
+Extension { #name : #FFICalloutMethodBuilder }
+
+{ #category : #'*Deprecated80' }
+FFICalloutMethodBuilder >> moduleName [
+	self
+		deprecated: 'Please use #libraryName instead'
+		transformWith: '`@receiver moduleName' -> '`@receiver libraryName'.
+
+	^self moduleName
+]
diff --git a/src/Deprecated80/FFILibrary.extension.st b/src/Deprecated80/FFILibrary.extension.st
new file mode 100644
index 00000000000..fe42d2ed821
--- /dev/null
+++ b/src/Deprecated80/FFILibrary.extension.st
@@ -0,0 +1,10 @@
+Extension { #name : #FFILibrary }
+
+{ #category : #'*Deprecated80' }
+FFILibrary >> moduleName [
+	self
+		deprecated: 'Please use #libraryName instead'
+		transformWith: '`@receiver moduleName' -> '`@receiver libraryName'.
+
+	^self moduleName
+]