diff --git a/build/org.eclipse.cdt.make.ui/src/org/eclipse/cdt/make/internal/ui/text/makefile/FunctionReferenceRule.java b/build/org.eclipse.cdt.make.ui/src/org/eclipse/cdt/make/internal/ui/text/makefile/FunctionReferenceRule.java
index c4a0cf73468..7902bddb13c 100644
--- a/build/org.eclipse.cdt.make.ui/src/org/eclipse/cdt/make/internal/ui/text/makefile/FunctionReferenceRule.java
+++ b/build/org.eclipse.cdt.make.ui/src/org/eclipse/cdt/make/internal/ui/text/makefile/FunctionReferenceRule.java
@@ -43,7 +43,7 @@ public class FunctionReferenceRule extends WordRule {
 		}
 		@Override
 		public boolean isWordPart(char c) {
-			return !isClosedBracket && (c == '(' || Character.isJavaIdentifierPart(c));
+			return !isClosedBracket && (c == '(' || Character.isJavaIdentifierPart(c) || c == '-');
 		}
 	}