diff --git a/gfx/ots/src/glat.cc b/gfx/ots/src/glat.cc
--- a/gfx/ots/src/glat.cc
+++ b/gfx/ots/src/glat.cc
@@ -5,7 +5,7 @@
 #include "glat.h"
 
 #include "gloc.h"
-#include "lz4.h"
+#include "mozilla/Compression.h"
 #include <list>
 
 namespace ots {
@@ -201,14 +201,15 @@ bool OpenTypeGLAT_v3::Parse(const uint8_t* data, size_t length,
         return DropGraphite("Illegal nested compression");
       }
       std::vector<uint8_t> decompressed(this->compHead & FULL_SIZE);
-      int ret = LZ4_decompress_safe_partial(
+      size_t outputSize = 0;
+      bool ret = mozilla::Compression::LZ4::decompressPartial(
           reinterpret_cast<const char*>(data + table.offset()),
-          reinterpret_cast<char*>(decompressed.data()),
           table.remaining(),  // input buffer size (input size + padding)
+          reinterpret_cast<char*>(decompressed.data()),
           decompressed.size(),  // target output size
-          decompressed.size());  // output buffer size
-      if (ret != decompressed.size()) {
-        return DropGraphite("Decompression failed with error code %d", ret);
+          &outputSize);  // return output size
+      if (!ret || outputSize != decompressed.size()) {
+        return DropGraphite("Decompression failed");
       }
       return this->Parse(decompressed.data(), decompressed.size(), true);
     }
diff --git a/gfx/ots/src/silf.cc b/gfx/ots/src/silf.cc
--- a/gfx/ots/src/silf.cc
+++ b/gfx/ots/src/silf.cc
@@ -5,7 +5,7 @@
 #include "silf.h"
 
 #include "name.h"
-#include "lz4.h"
+#include "mozilla/Compression.h"
 #include <cmath>
 
 namespace ots {
@@ -39,14 +39,15 @@ bool OpenTypeSILF::Parse(const uint8_t* data, size_t length,
           return DropGraphite("Illegal nested compression");
         }
         std::vector<uint8_t> decompressed(this->compHead & FULL_SIZE);
-        int ret = LZ4_decompress_safe_partial(
+        size_t outputSize = 0;
+        bool ret = mozilla::Compression::LZ4::decompressPartial(
             reinterpret_cast<const char*>(data + table.offset()),
-            reinterpret_cast<char*>(decompressed.data()),
             table.remaining(),  // input buffer size (input size + padding)
+            reinterpret_cast<char*>(decompressed.data()),
             decompressed.size(),  // target output size
-            decompressed.size());  // output buffer size
-        if (ret != decompressed.size()) {
-          return DropGraphite("Decompression failed with error code %d", ret);
+            &outputSize);   // return output size
+        if (!ret || outputSize != decompressed.size()) {
+          return DropGraphite("Decompression failed");
         }
         return this->Parse(decompressed.data(), decompressed.size(), true);
       }