diff --git a/Dockerfile b/Dockerfile
index b1064f4..3b8725e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,7 +12,7 @@ WORKDIR /opt
 
 RUN git clone https://github.com/flutter/flutter.git -b stable
 
-ENV PATH="${PATH}:/opt/flutter/bin:/usr/lib/dart/bin"
+ENV PATH=$PATH:/opt/flutter/bin:/usr/lib/dart/bin
 
 RUN flutter precache && flutter doctor
 
@@ -20,6 +20,6 @@ ADD https://binaries.sonarsource.com/Distribution/sonar-scanner-cli/sonar-scanne
 
 RUN unzip /opt/sonar-scanner-cli-4.7.0.2747-linux.zip
 
-ENV PATH="${PATH}:/opt/flutter/bin:/usr/lib/dart/bin:/opt/sonar-scanner-4.7.0.2747-linux/bin"
+ENV PATH=$PATH:/opt/sonar-scanner-4.7.0.2747-linux/bin
 
 RUN rm -Rf /var/cache/apt
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