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-rw-r--r--lib/system/ansi_c.nim2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/system/ansi_c.nim b/lib/system/ansi_c.nim
index 5111bc3cf..511a006d3 100644
--- a/lib/system/ansi_c.nim
+++ b/lib/system/ansi_c.nim
@@ -106,7 +106,7 @@ proc c_fopen(filename, mode: cstring): C_TextFileStar {.
   importc: "fopen", header: "<stdio.h>".}
 proc c_fclose(f: C_TextFileStar) {.importc: "fclose", header: "<stdio.h>".}
 
-proc c_sprintf(buf, frmt: cstring) {.header: "<stdio.h>", 
+proc c_sprintf(buf, frmt: cstring): cint {.header: "<stdio.h>", 
   importc: "sprintf", varargs, noSideEffect.}
   # we use it only in a way that cannot lead to security issues