diff --git a/app/build.gradle b/app/build.gradle
index 15dba05..ef6f2cd 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -10,7 +10,7 @@ android {
         targetSdkVersion 22
         versionCode 29
         versionName "1.28"
-        renderscriptTargetApi 19
+        renderscriptTargetApi 18
         renderscriptSupportModeEnabled true
     }
     buildTypes {
diff --git a/app/src/main/rs/blur.rsh b/app/src/main/rs/blur.rsh
index 5c8b282..68072a4 100644
--- a/app/src/main/rs/blur.rsh
+++ b/app/src/main/rs/blur.rsh
@@ -23,7 +23,7 @@ limitations under the License.
 
 void adjust_blur(int blur)
 {
-    user_blur = clamp(blur, -3, 3);
+    user_blur = min(max(blur, -3), 3);
 }
 
 #endif