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-rw-r--r--include/dahdi/kernel.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/dahdi/kernel.h b/include/dahdi/kernel.h
index 42a59d9..22fc3ee 100644
--- a/include/dahdi/kernel.h
+++ b/include/dahdi/kernel.h
@@ -1186,7 +1186,9 @@ static inline short dahdi_txtone_nextsample(struct dahdi_chan *ss)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31)
#define KERN_CONT ""
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
-#define clamp(x, low, high) min (max (low, x), high)
+#ifndef clamp
+#define clamp(x, low, high) min(max(low, x), high)
+#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25)
/* Some distributions backported fatal_signal_pending so we'll use a macro to