diff --git a/netcdf4/build.gradle b/netcdf4/build.gradle
index 62cd44ad5c..7f9578aed9 100644
--- a/netcdf4/build.gradle
+++ b/netcdf4/build.gradle
@@ -29,7 +29,7 @@ dependencies {
 
 sourceSets {
   unloadedTest {
-    resources.srcDir file('src/unloadedTest/resources')
+    resources.srcDirs = [file('src/unloadedTest/resources')]
     compileClasspath += sourceSets.main.output + configurations.testCompileClasspath
     runtimeClasspath += output + sourceSets.main.output + configurations.testRuntimeClasspath
   }