diff --git a/SingleSource/UnitTests/Vector/Altivec/alti.expandfft.c b/SingleSource/UnitTests/Vector/Altivec/alti.expandfft.c
--- a/SingleSource/UnitTests/Vector/Altivec/alti.expandfft.c
+++ b/SingleSource/UnitTests/Vector/Altivec/alti.expandfft.c
@@ -35,10 +35,17 @@
    float *x,*y,*z,*w;
    double t1,mflops;
 /* allocate storage for x,y,z,w on 4-word bndr. */
+#if defined(_AIX)
+   posix_memalign((void **)&x,16,8*N);
+   posix_memalign((void **)&y,16,8*N);
+   posix_memalign((void **)&z,16,8*N);
+   posix_memalign((void **)&w,16,4*N);
+#else
    x = (float *) malloc(8*N);
    y = (float *) malloc(8*N);
    z = (float *) malloc(8*N);
    w = (float *) malloc(4*N);
+#endif
    n     = 2;
    for(ln2=1;ln2<21;ln2++){
       first = 1;
diff --git a/SingleSource/UnitTests/Vector/Altivec/alti.stepfft.c b/SingleSource/UnitTests/Vector/Altivec/alti.stepfft.c
--- a/SingleSource/UnitTests/Vector/Altivec/alti.stepfft.c
+++ b/SingleSource/UnitTests/Vector/Altivec/alti.stepfft.c
@@ -27,10 +27,17 @@
    float *x,*y,*z,*w;
    float t1,ln2,mflops;
 /* allocate storage for x,y,z,w on 4-word bndr. */
+#if defined(_AIX)
+   posix_memalign((void **)&x,16,8*N);
+   posix_memalign((void **)&y,16,8*N);
+   posix_memalign((void **)&z,16,8*N);
+   posix_memalign((void **)&w,16,4*N);
+#else
    x = (float *)malloc(8*N);
    y = (float *)malloc(8*N);
    z = (float *)malloc(8*N);
    w = (float *)malloc(4*N);
+#endif
    first = 1;
    for(icase=0;icase<2;icase++){
    if(first){