diff --git a/Makefile b/Makefile
index 62d7c5c..fc37293 100644
--- a/Makefile
+++ b/Makefile
@@ -26,7 +26,7 @@
 # OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 # IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.# IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-CFLAGS=-I inc -I test -Os -Wall -Werror -pedantic-errors -Wextra -Wshadow
+CFLAGS=-I inc -I test -Os -Wall -Werror -pedantic-errors -Wextra -Wshadow -Wparentheses
 
 QCBOR_OBJ=src/UsefulBuf.o src/qcbor_encode.o src/qcbor_decode.o src/ieee754.o 
 QCBOR_OBJ2=$(QCBOR_OBJ) src/qcbor_decode_malloc.o
diff --git a/test/qcbor_decode_tests.c b/test/qcbor_decode_tests.c
index 558074f..999a9b7 100644
--- a/test/qcbor_decode_tests.c
+++ b/test/qcbor_decode_tests.c
@@ -524,7 +524,7 @@
       goto Done;
    
    // First integer
-   if(QCBORDecode_GetNext(&DCtx, &Item) != 0 | Item.uDataType != QCBOR_TYPE_INT64)
+   if(QCBORDecode_GetNext(&DCtx, &Item) != 0 || Item.uDataType != QCBOR_TYPE_INT64)
       goto Done;
    *pInt1 = Item.val.int64;
    
@@ -2267,14 +2267,14 @@
     }
     
     QCBORDecode_GetNext(&DC, &Item);
-    if(Item.uDataType != QCBOR_TYPE_INT64 |
+    if(Item.uDataType != QCBOR_TYPE_INT64 ||
        Item.uNestingLevel != 2 ||
        Item.uNextNestLevel != 2) {
         return -4;
     }
     
     QCBORDecode_GetNext(&DC, &Item);
-    if(Item.uDataType != QCBOR_TYPE_INT64 |
+    if(Item.uDataType != QCBOR_TYPE_INT64 ||
        Item.uNestingLevel != 2 ||
        Item.uNextNestLevel != 0) {
         return -5;