diff --git a/Interop/Indexer/build.gradle b/Interop/Indexer/build.gradle
index 7d74180b85a..f5e59f843a3 100644
--- a/Interop/Indexer/build.gradle
+++ b/Interop/Indexer/build.gradle
@@ -89,6 +89,9 @@ model {
         cppCompiler.withArguments { args ->
           args.remove "/usr/include"
         }
+	cCompiler.withArguments { args ->
+          args.remove "/usr/include"
+        }
       }
     }
   }
diff --git a/Interop/Runtime/build.gradle b/Interop/Runtime/build.gradle
index 358c47cabc5..09fe90e3327 100644
--- a/Interop/Runtime/build.gradle
+++ b/Interop/Runtime/build.gradle
@@ -41,6 +41,16 @@ model {
         }
    }
 
+   /* HACK over gradle 4.4, it adds /usr/include, that affects our --sysroot flag */
+   toolChains {
+     clang(Clang) {
+       eachPlatform {
+         cCompiler.withArguments { args ->
+           args.remove "/usr/include"
+         }
+       }
+     }
+   }
 }
 
 dependencies {