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-rw-r--r--lib/std/syncio.nim2
-rw-r--r--lib/system/ansi_c.nim2
2 files changed, 2 insertions, 2 deletions
diff --git a/lib/std/syncio.nim b/lib/std/syncio.nim
index dadad9791..d406c254f 100644
--- a/lib/std/syncio.nim
+++ b/lib/std/syncio.nim
@@ -105,7 +105,7 @@ proc c_feof(f: File): cint {.
   importc: "feof", header: "<stdio.h>".}
 
 when not declared(c_fwrite):
-  proc c_fwrite(buf: pointer, size, n: csize_t, f: File): cint {.
+  proc c_fwrite(buf: pointer, size, n: csize_t, f: File): csize_t {.
     importc: "fwrite", header: "<stdio.h>".}
 
 # C routine that is used here:
diff --git a/lib/system/ansi_c.nim b/lib/system/ansi_c.nim
index ae4b90504..a8a4bd767 100644
--- a/lib/system/ansi_c.nim
+++ b/lib/system/ansi_c.nim
@@ -211,7 +211,7 @@ else:
   proc c_realloc*(p: pointer, newsize: csize_t): pointer {.
     importc: "realloc", header: "<stdlib.h>".}
 
-proc c_fwrite*(buf: pointer, size, n: csize_t, f: CFilePtr): cint {.
+proc c_fwrite*(buf: pointer, size, n: csize_t, f: CFilePtr): csize_t {.
   importc: "fwrite", header: "<stdio.h>".}
 
 proc c_fflush*(f: CFilePtr): cint {.