diff --git a/kiss_fft.c b/kiss_fft.c
index fb048e7..1f8a8a2 100644
--- a/kiss_fft.c
+++ b/kiss_fft.c
@@ -14,6 +14,8 @@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 
 
 #include "_kiss_fft_guts.h"
+
+
 /* The guts header contains all the multiplication and addition macros that are defined for
  fixed or floating point complex numbers.  It also delares the kf_ internal functions.
  */
@@ -69,6 +71,7 @@ static void kf_bfly4(
     const size_t m2=2*m;
     const size_t m3=3*m;
 
+
     tw3 = tw2 = tw1 = st->twiddles;
 
     do {
@@ -265,7 +268,7 @@ void kf_work(
 #ifdef _OPENMP
     // use openmp extensions at the 
     // top-level (not recursive)
-    if (fstride==1) {
+    if (fstride==1 && m != 1) {
         int k;
 
         // execute the p different work units in different threads