diff --git a/dlls/crypt32/context.c b/dlls/crypt32/context.c
index 558be9d25af..1b2f7d1682b 100644
--- a/dlls/crypt32/context.c
+++ b/dlls/crypt32/context.c
@@ -74,7 +74,7 @@ void *Context_CreateDataContext(size_t contextSize)
     return ret;
 }
 
-void *Context_CreateLinkContext(size_t contextSize, void *linked, size_t extra,
+void *Context_CreateLinkContext(unsigned int contextSize, void *linked, unsigned int extra,
  BOOL addRef)
 {
     void *context = CryptMemAlloc(contextSize + sizeof(LINK_CONTEXT) + extra);
diff --git a/dlls/crypt32/crypt32_private.h b/dlls/crypt32/crypt32_private.h
index 8ac04849884..3ef44b4fb90 100644
--- a/dlls/crypt32/crypt32_private.h
+++ b/dlls/crypt32/crypt32_private.h
@@ -115,7 +115,7 @@ void *Context_CreateDataContext(size_t contextSize);
  * it should be) linked is addref'd.
  * Free with Context_Release.
  */
-void *Context_CreateLinkContext(size_t contextSize, void *linked, size_t extra,
+void *Context_CreateLinkContext(unsigned int contextSize, void *linked, unsigned int extra,
  BOOL addRef);
 
 /* Returns a pointer to the extra bytes allocated with context, which must be
diff --git a/dlls/crypt32/store.c b/dlls/crypt32/store.c
index 2ea714e84b1..95b91dabce4 100644
--- a/dlls/crypt32/store.c
+++ b/dlls/crypt32/store.c
@@ -377,7 +377,7 @@ static void *CRYPT_CollectionCreateContextFromChild(PWINE_COLLECTIONSTORE store,
 }
 
 static BOOL CRYPT_CollectionAddContext(PWINE_COLLECTIONSTORE store,
- size_t contextStoreOffset, void *context, void *toReplace, size_t contextSize,
+ unsigned int contextStoreOffset, void *context, void *toReplace, unsigned int contextSize,
  void **pChildContext)
 {
     BOOL ret;