diff --git a/tools/copy-libs.sh b/tools/copy-libs.sh
index 565eb4542..bbc89e089 100755
--- a/tools/copy-libs.sh
+++ b/tools/copy-libs.sh
@@ -102,7 +102,7 @@ for item in "${@:2:${#@}-5}"; do
 			INCLUDES+="$item "
 		fi
 	elif [ "$prefix" = "-D" ]; then
-		if [[ "${item:2:7}" != "ARDUINO" ]] && [[ "$item" != "-DESP32" ]]; then #skip ARDUINO defines
+		if [[ "${item:2:7}" != "ARDUINO" ]] && [[ "$item" != "-DESP32=ESP32" ]]; then #skip ARDUINO defines
 			DEFINES+="$item "
 		fi
 	elif [ "$prefix" = "-O" ]; then