diff --git a/impl/src/layer1/preamble.c b/impl/src/layer1/preamble.c
index 07c8638..e7f02da 100644
--- a/impl/src/layer1/preamble.c
+++ b/impl/src/layer1/preamble.c
@@ -19,7 +19,7 @@ const float complex* preamble_get_symbols(void)
 
 		for(unsigned i = 0; i < PREAMBLE_LEN; i++) {
 			unsigned int bit = msequence_advance(mseq);
-			symbol_cache[i] = bit ? 1.0f : -1.0f;
+			symbol_cache[i] = bit ? -1.0f : 1.0f;
 		}
 
 		msequence_destroy(mseq);