diff --git a/.appveyor.yml b/.appveyor.yml
index 8f35ef331..56c8d5b27 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -17,6 +17,7 @@ environment:
   GIT_CLONE_DIR: $(ECMWF)\git
   INSTALL_DIR: $(ECMWF)\install
   ECCODES_SRC: $(GIT_CLONE_DIR)\eccodes
+  WINDOWS_TESTING_BASHRC: $(ECCODES_SRC)\tests\windows_testing.bashrc
   ECBUILD_SRC: $(GIT_CLONE_DIR)\ecbuild
 
 # scripts that are called at very beginning, before repo cloning
@@ -78,7 +79,8 @@ build_script:
                -D ENABLE_JPG=1 ^
                -D IEEE_LE=1 ^
                -D ENABLE_MEMFS=0 ^
-               -D ENABLE_EXTRA_TESTS=OFF ^
+               -D ENABLE_EXTRA_TESTS=ON ^
+               -D WINDOWS_TESTING_BASHRC=%WINDOWS_TESTING_BASHRC% ^
                ..
   - cmd: nmake
   - cmd: ctest --output-on-failure
diff --git a/tests/bufr_extract_headers.c b/tests/bufr_extract_headers.c
index 520d0532e..cebdc7552 100644
--- a/tests/bufr_extract_headers.c
+++ b/tests/bufr_extract_headers.c
@@ -12,6 +12,7 @@
 #include <assert.h>
 
 #define MAX_KEYS 100
+
 int main(int argc, char* argv[])
 {
     char *filename, *keys;
@@ -34,7 +35,7 @@ int main(int argc, char* argv[])
         printf("ERROR: %s\n",grib_get_error_message(err));
         return 1;
     }
-    
+
     /* Mimic the behaviour of bufr_get -f -p keys for testing */
     err = parse_keyval_string(NULL, keys, 0, GRIB_TYPE_UNDEFINED, requested_print_keys, &requested_print_keys_count);
     assert(requested_print_keys_count > 0);
diff --git a/tests/windows_testing.bashrc b/tests/windows_testing.bashrc
index f65068a8b..60b316082 100644
--- a/tests/windows_testing.bashrc
+++ b/tests/windows_testing.bashrc
@@ -9,3 +9,15 @@ function diff {
     command diff --strip-trailing-cr "$@"
 }
 export -f diff
+
+# We occasionally cat text files and use the lines as arguments.
+# Carriage returns here cause issues and need to be removed.
+function cat {
+    if [[ $# -eq 1 && "$1" =~ ".txt" ]]
+    then
+        command cat "$@" | sed 's/\r$//'
+    else
+        command cat "$@"
+    fi
+}
+export -f cat