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diff --git a/src/util.c b/src/util.c
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index ab49890..7332891 100644
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--- a/src/util.c
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+++ b/src/util.c
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@@ -203,7 +203,7 @@ tape_fill_input_buffer (int in_des, int num_bytes)
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       get_next_reel (in_des);
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       input_size = rmtread (in_des, input_buffer, num_bytes);
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     }
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-  if (input_size < 0)
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+  if (input_size == SAFE_READ_ERROR)
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     error (1, errno, _("read error"));
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   if (input_size == 0)
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     {
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@@ -224,7 +224,7 @@ disk_fill_input_buffer (int in_des, off_t num_bytes)
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   in_buff = input_buffer;
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   num_bytes = (num_bytes < DISK_IO_BLOCK_SIZE) ? num_bytes : DISK_IO_BLOCK_SIZE;
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   input_size = read (in_des, input_buffer, num_bytes);
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-  if (input_size < 0) 
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+  if (input_size == SAFE_READ_ERROR)
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     {
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       input_size = 0;
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       return (-1);