diff --git a/metadata/org.sufficientlysecure.viewer.txt b/metadata/org.sufficientlysecure.viewer.txt
index 5cf6e4e1d0..6745d1be78 100644
--- a/metadata/org.sufficientlysecure.viewer.txt
+++ b/metadata/org.sufficientlysecure.viewer.txt
@@ -929,6 +929,7 @@ Build:2.8.0,2801
         popd
     scandelete=document-viewer/jni/mupdf/mupdf/build/release/,document-viewer/jni/mupdf/mupdf/thirdparty/curl/tests/data/test*
     buildjni=yes
+    ndk=r15c
 
 Build:2.8.0,2802
     commit=v2.8.0
@@ -945,6 +946,7 @@ Build:2.8.0,2802
         popd
     scandelete=document-viewer/jni/mupdf/mupdf/build/release/,document-viewer/jni/mupdf/mupdf/thirdparty/curl/tests/data/test*
     buildjni=yes
+    ndk=r15c
 
 Build:2.8.0,2803
     commit=v2.8.0
@@ -961,6 +963,7 @@ Build:2.8.0,2803
         popd
     scandelete=document-viewer/jni/mupdf/mupdf/build/release/,document-viewer/jni/mupdf/mupdf/thirdparty/curl/tests/data/test*
     buildjni=yes
+    ndk=r15c
 
 Build:2.8.0,2804
     commit=v2.8.0
@@ -977,6 +980,7 @@ Build:2.8.0,2804
         popd
     scandelete=document-viewer/jni/mupdf/mupdf/build/release/,document-viewer/jni/mupdf/mupdf/thirdparty/curl/tests/data/test*
     buildjni=yes
+    ndk=r15c
 
 Build:2.8.0,2805
     commit=v2.8.0
@@ -993,6 +997,7 @@ Build:2.8.0,2805
         popd
     scandelete=document-viewer/jni/mupdf/mupdf/build/release/,document-viewer/jni/mupdf/mupdf/thirdparty/curl/tests/data/test*
     buildjni=yes
+    ndk=r15c
 
 Build:2.8.0,2806
     commit=v2.8.0
@@ -1009,6 +1014,7 @@ Build:2.8.0,2806
         popd
     scandelete=document-viewer/jni/mupdf/mupdf/build/release/,document-viewer/jni/mupdf/mupdf/thirdparty/curl/tests/data/test*
     buildjni=yes
+    ndk=r15c
 
 Build:2.8.0,2807
     commit=v2.8.0
@@ -1025,6 +1031,7 @@ Build:2.8.0,2807
         popd
     scandelete=document-viewer/jni/mupdf/mupdf/build/release/,document-viewer/jni/mupdf/mupdf/thirdparty/curl/tests/data/test*
     buildjni=yes
+    ndk=r15c
 
 Maintainer Notes:
 * Check init.sh from time to time.