diff --git a/dlls/msvcp100/ios.c b/dlls/msvcp100/ios.c
index 6b1fcc87de6..8122ad138e1 100644
--- a/dlls/msvcp100/ios.c
+++ b/dlls/msvcp100/ios.c
@@ -1993,7 +1993,7 @@ static basic_filebuf_char* basic_filebuf_char_close(basic_filebuf_char *this)
     /* TODO: handle exceptions */
     if(!basic_filebuf_char__Endwrite(this))
         ret = NULL;
-    if(!fclose(this->file))
+    if(fclose(this->file))
         ret  = NULL;
 
     basic_filebuf_char__Init(this, NULL, INITFL_close);
@@ -2482,7 +2482,7 @@ static basic_filebuf_wchar* basic_filebuf_wchar_close(basic_filebuf_wchar *this)
     /* TODO: handle exceptions */
     if(!basic_filebuf_wchar__Endwrite(this))
         ret = NULL;
-    if(!fclose(this->file))
+    if(fclose(this->file))
         ret  = NULL;
 
     basic_filebuf_wchar__Init(this, NULL, INITFL_close);
diff --git a/dlls/msvcp60/ios.c b/dlls/msvcp60/ios.c
index 2b06716c4da..43bd10bc5cf 100644
--- a/dlls/msvcp60/ios.c
+++ b/dlls/msvcp60/ios.c
@@ -2331,7 +2331,7 @@ basic_filebuf_char* __thiscall basic_filebuf_char_close(basic_filebuf_char *this
     /* TODO: handle exceptions */
     if(!basic_filebuf_char__Endwrite(this))
         ret = NULL;
-    if(!fclose(this->file))
+    if(fclose(this->file))
         ret  = NULL;
 
     basic_filebuf_char__Init(this, NULL, INITFL_close);
@@ -2901,7 +2901,7 @@ basic_filebuf_wchar* __thiscall basic_filebuf_wchar_close(basic_filebuf_wchar *t
     /* TODO: handle exceptions */
     if(!basic_filebuf_wchar__Endwrite(this))
         ret = NULL;
-    if(!fclose(this->file))
+    if(fclose(this->file))
         ret  = NULL;
 
     basic_filebuf_wchar__Init(this, NULL, INITFL_close);
diff --git a/dlls/msvcp71/ios.c b/dlls/msvcp71/ios.c
index d2a1eb6dc12..32e39418617 100644
--- a/dlls/msvcp71/ios.c
+++ b/dlls/msvcp71/ios.c
@@ -2414,7 +2414,7 @@ basic_filebuf_char* __thiscall basic_filebuf_char_close(basic_filebuf_char *this
     /* TODO: handle exceptions */
     if(!basic_filebuf_char__Endwrite(this))
         ret = NULL;
-    if(!fclose(this->file))
+    if(fclose(this->file))
         ret  = NULL;
 
     basic_filebuf_char__Init(this, NULL, INITFL_close);
@@ -2974,7 +2974,7 @@ basic_filebuf_wchar* __thiscall basic_filebuf_wchar_close(basic_filebuf_wchar *t
     /* TODO: handle exceptions */
     if(!basic_filebuf_wchar__Endwrite(this))
         ret = NULL;
-    if(!fclose(this->file))
+    if(fclose(this->file))
         ret  = NULL;
 
     basic_filebuf_wchar__Init(this, NULL, INITFL_close);