diff --git a/CSSLayout/CSSLayout.c b/CSSLayout/CSSLayout.c
index 76f37349..48bd4127 100644
--- a/CSSLayout/CSSLayout.c
+++ b/CSSLayout/CSSLayout.c
@@ -208,7 +208,7 @@ void CSSNodeInit(const CSSNodeRef node) {
   node->layout.cachedLayout.heightMeasureMode = (CSSMeasureMode) -1;
 }
 
-void _CSSNodeMarkDirty(const CSSNodeRef node) {
+static void _CSSNodeMarkDirty(const CSSNodeRef node) {
   if (!node->isDirty) {
     node->isDirty = true;
     node->layout.computedFlexBasis = CSSUndefined;
diff --git a/CSSLayout/CSSLayout.h b/CSSLayout/CSSLayout.h
index 9c4a1012..7289492d 100644
--- a/CSSLayout/CSSLayout.h
+++ b/CSSLayout/CSSLayout.h
@@ -127,11 +127,11 @@ typedef void (*CSSAssertFailFunc)(const char *message);
 #endif
 
 // CSSNode
-WIN_EXPORT CSSNodeRef CSSNodeNew();
+WIN_EXPORT CSSNodeRef CSSNodeNew(void);
 WIN_EXPORT void CSSNodeInit(const CSSNodeRef node);
 WIN_EXPORT void CSSNodeFree(const CSSNodeRef node);
 WIN_EXPORT void CSSNodeFreeRecursive(const CSSNodeRef node);
-WIN_EXPORT int32_t CSSNodeGetInstanceCount();
+WIN_EXPORT int32_t CSSNodeGetInstanceCount(void);
 
 WIN_EXPORT void CSSNodeInsertChild(const CSSNodeRef node, const CSSNodeRef child, const uint32_t index);
 WIN_EXPORT void CSSNodeRemoveChild(const CSSNodeRef node, const CSSNodeRef child);