diff --git a/antlr4-maven-plugin/src/main/java/org/antlr/mojo/antlr4/Antlr4Mojo.java b/antlr4-maven-plugin/src/main/java/org/antlr/mojo/antlr4/Antlr4Mojo.java
index 0a81f51fb..c0926fe6c 100644
--- a/antlr4-maven-plugin/src/main/java/org/antlr/mojo/antlr4/Antlr4Mojo.java
+++ b/antlr4-maven-plugin/src/main/java/org/antlr/mojo/antlr4/Antlr4Mojo.java
@@ -412,10 +412,7 @@ public class Antlr4Mojo extends AbstractMojo {
 		// Iterate each grammar file we were given and add it into the tool's list of
 		// grammars to process.
 		for (File grammarFile : grammarFiles) {
-			if (!buildContext.hasDelta(grammarFile)) {
-				continue;
-			}
-
+			buildContext.refresh(grammarFile);
 			buildContext.removeMessages(grammarFile);
 
 			getLog().debug("Grammar file '" + grammarFile.getPath() + "' detected.");