diff --git a/gradle-plugin/src/main/groovy/mozilla/telemetry/glean-gradle-plugin/GleanGradlePlugin.groovy b/gradle-plugin/src/main/groovy/mozilla/telemetry/glean-gradle-plugin/GleanGradlePlugin.groovy
index 601317187a..6d3a596b21 100644
--- a/gradle-plugin/src/main/groovy/mozilla/telemetry/glean-gradle-plugin/GleanGradlePlugin.groovy
+++ b/gradle-plugin/src/main/groovy/mozilla/telemetry/glean-gradle-plugin/GleanGradlePlugin.groovy
@@ -406,6 +406,7 @@ except:
                     args "pip"
                     args "install"
                     args "glean_parser"
+                    args "--no-index"
                     args "-f"
                     args pythonPackagesDir
                 }