diff --git a/tools/kiss_fftr.c b/tools/kiss_fftr.c
index c362c4e..8102132 100644
--- a/tools/kiss_fftr.c
+++ b/tools/kiss_fftr.c
@@ -22,7 +22,7 @@ kiss_fftr_cfg kiss_fftr_alloc(int nfft,int inverse_fft,void * mem,size_t * lenme
 {
     int i;
     kiss_fftr_cfg st = NULL;
-    size_t subsize, memneeded;
+    size_t subsize = 0, memneeded;
 
     if (nfft & 1) {
         fprintf(stderr,"Real FFT optimization must be even.\n");