diff --git a/dlls/wininet/http.c b/dlls/wininet/http.c
index f91fd21e321..cd2cdcf5cbd 100644
--- a/dlls/wininet/http.c
+++ b/dlls/wininet/http.c
@@ -3565,7 +3565,7 @@ static DWORD HTTP_HttpQueryInfoW(http_request_t *request, DWORD dwInfoLevel,
         LPVOID lpBuffer, LPDWORD lpdwBufferLength, LPDWORD lpdwIndex)
 {
     LPHTTPHEADERW lphttpHdr = NULL;
-    BOOL request_only = dwInfoLevel & HTTP_QUERY_FLAG_REQUEST_HEADERS;
+    BOOL request_only = !!(dwInfoLevel & HTTP_QUERY_FLAG_REQUEST_HEADERS);
     INT requested_index = lpdwIndex ? *lpdwIndex : 0;
     DWORD level = (dwInfoLevel & ~HTTP_QUERY_MODIFIER_FLAGS_MASK);
     INT index = -1;
@@ -6102,7 +6102,7 @@ static DWORD HTTP_ProcessHeader(http_request_t *request, LPCWSTR field, LPCWSTR
 {
     LPHTTPHEADERW lphttpHdr = NULL;
     INT index;
-    BOOL request_only = dwModifier & HTTP_ADDHDR_FLAG_REQ;
+    BOOL request_only = !!(dwModifier & HTTP_ADDHDR_FLAG_REQ);
     DWORD res = ERROR_HTTP_INVALID_HEADER;
 
     TRACE("--> %s: %s - 0x%08x\n", debugstr_w(field), debugstr_w(value), dwModifier);