diff --git a/mms-lib/src/mms_file_util.c b/mms-lib/src/mms_file_util.c
index a906672..f508928 100644
--- a/mms-lib/src/mms_file_util.c
+++ b/mms-lib/src/mms_file_util.c
@@ -177,6 +177,51 @@ mms_write_bytes(
     return mms_write_file(dir, file, data, len, path);
 }
 
+/**
+ * Copies the file. Assumes that the destination directory exists.
+ */
+gboolean
+mms_file_copy(
+    const char* src,
+    const char* dest,
+    GError** error)
+{
+    gboolean ok = FALSE;
+    int out = open(dest, O_CREAT|O_WRONLY|O_TRUNC|O_BINARY, MMS_FILE_PERM);
+    if (out >= 0) {
+        int in = open(src, O_RDONLY | O_BINARY);
+        if (in >= 0) {
+            int nbytes;
+            const size_t buflen = 4096;
+            void* buf = g_malloc(buflen);
+            ok = TRUE;
+            while ((nbytes = read(in, buf, buflen)) > 0) {
+                if (write(out, buf, nbytes) < nbytes) {
+                    ok = FALSE;
+                    MMS_ERROR(error, MMS_LIB_ERROR_IO,
+                        "Failed to write %s: %s", dest, strerror(errno));
+                    break;
+                }
+            }
+            if (nbytes < 0) {
+                ok = FALSE;
+                MMS_ERROR(error, MMS_LIB_ERROR_IO,
+                    "Failed to read %s: %s", src, strerror(errno));
+            }
+            g_free(buf);
+            close(in);
+        } else {
+            MMS_ERROR(error, MMS_LIB_ERROR_IO,
+                "Failed to open file %s: %s", src, strerror(errno));
+        }
+        close(out);
+    } else {
+        MMS_ERROR(error, MMS_LIB_ERROR_IO,
+            "Failed to create file %s: %s", dest, strerror(errno));
+    }
+    return ok;
+}
+
 /*
  * Local Variables:
  * mode: C
diff --git a/mms-lib/src/mms_file_util.h b/mms-lib/src/mms_file_util.h
index fd28feb..f308067 100644
--- a/mms-lib/src/mms_file_util.h
+++ b/mms-lib/src/mms_file_util.h
@@ -69,6 +69,12 @@ mms_write_bytes(
     GBytes* bytes,
     char** path);
 
+gboolean
+mms_file_copy(
+    const char* src,
+    const char* dest,
+    GError** error);
+
 #define mms_message_dir(config,id) \
     (g_strconcat((config)->root_dir, "/" MMS_MESSAGE_DIR "/" , id, NULL))
 #define mms_task_dir(task) \
diff --git a/mms-lib/src/mms_task_encode.c b/mms-lib/src/mms_task_encode.c
index e8789f8..856ff92 100644
--- a/mms-lib/src/mms_task_encode.c
+++ b/mms-lib/src/mms_task_encode.c
@@ -467,8 +467,6 @@ mms_task_encode_prepare_attachments(
         MMSAttachmentInfo info = parts[i];
         char* detected_type = NULL;
         char* path;
-        GFile* src;
-        GFile* dest;
 
         if (!info.content_type || !info.content_type[0]) {
             detected_type = mms_attachment_guess_content_type(info.file_name);
@@ -479,9 +477,7 @@ mms_task_encode_prepare_attachments(
             g_basename(info.file_name), info.content_type);
         G_GNUC_END_IGNORE_DEPRECATIONS;
 
-        src = g_file_new_for_path(info.file_name);
-        dest = g_file_new_for_path(path);
-        if (g_file_copy(src, dest, 0, NULL, NULL, NULL, error)) {
+        if (mms_file_copy(info.file_name, path, error)) {
             info.file_name = path;
             attachment = mms_attachment_new(config, &info, error);
             if (attachment) {
@@ -494,8 +490,7 @@ mms_task_encode_prepare_attachments(
         } else if (error && *error) {
             MMS_ERR("%s", MMS_ERRMSG(*error));
         }
-        g_object_unref(src);
-        g_object_unref(dest);
+
         g_free(detected_type);
         g_free(path);
         if (!attachment) break;
diff --git a/mms-lib/test/resize/test_resize.c b/mms-lib/test/resize/test_resize.c
index b048277..485530f 100644
--- a/mms-lib/test/resize/test_resize.c
+++ b/mms-lib/test/resize/test_resize.c
@@ -15,6 +15,7 @@
 #include "mms_attachment.h"
 #include "mms_lib_util.h"
 #include "mms_lib_log.h"
+#include "mms_file_util.h"
 #include "mms_log.h"
 
 #include <libexif/exif-content.h>
@@ -342,31 +343,6 @@ test_png_size(
     return ok;
 }
 
-static
-gboolean
-test_file_copy(
-    const char* src,
-    const char* dest)
-{
-    gboolean ok = FALSE;
-    FILE* in = fopen(src, "rb");
-    if (in) {
-        FILE* out = fopen(dest, "wb");
-        if (out) {
-            const size_t buflen = 4096;
-            size_t nbytes;
-            void* buf = g_malloc(buflen);
-            while ((nbytes = fread(buf, 1, buflen, in)) > 0 &&
-                   fwrite(buf, 1, nbytes, out) == nbytes);
-            ok = (feof(in) && !ferror(in) && !ferror(out));
-            g_free(buf);
-            fclose(out);
-        }
-        fclose(in);
-    }
-    return ok;
-}
-
 static
 int
 test_run_one(
@@ -382,7 +358,7 @@ test_run_one(
     if (dir) {
         GError* error = NULL;
         char* testfile = g_strconcat(dir, "/", name, NULL);
-        if (test_file_copy(test->file, testfile)) {
+        if (mms_file_copy(test->file, testfile, NULL)) {
             MMSAttachment* at;
             MMSAttachmentInfo info;
             MMSConfig test_config = *config;
diff --git a/rpm/mms-engine.spec b/rpm/mms-engine.spec
index 0eff9b4..780ceeb 100644
--- a/rpm/mms-engine.spec
+++ b/rpm/mms-engine.spec
@@ -12,6 +12,8 @@ Requires: ofono
 
 BuildRequires: python
 BuildRequires: file-devel
+BuildRequires: libpng-devel
+BuildRequires: libexif-devel
 BuildRequires: libjpeg-turbo-devel
 BuildRequires: pkgconfig(glib-2.0) >= 2.32
 BuildRequires: pkgconfig(libsoup-2.4) >= 2.38
@@ -62,6 +64,9 @@ cp %{src}/%{dbusname}.push.conf %{buildroot}%{pushconfig}/%{dbusname}.conf
 cp mms-dump/build/release/mms-dump %{buildroot}%{_prefix}/bin/
 cp mms-send/build/release/mms-send %{buildroot}%{_prefix}/bin/
 
+%check
+make -C mms-lib/test test
+
 %files
 %defattr(-,root,root,-)
 %config %{dbuspolicy}/%{dbusname}.conf