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-rw-r--r--unsupported/test/FFT.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/unsupported/test/FFT.cpp b/unsupported/test/FFT.cpp
index 3e4126522..b029ba655 100644
--- a/unsupported/test/FFT.cpp
+++ b/unsupported/test/FFT.cpp
@@ -45,7 +45,7 @@ complex<long double> promote(long double x) { return complex<long double>( x);
long double totalpower=0;
long double difpower=0;
cerr <<"idx\ttruth\t\tvalue\t|dif|=\n";
- long double pi = acos(-1);
+ long double pi = acos((long double)-1);
for (size_t k0=0;k0<size_t(fftbuf.size());++k0) {
complex<long double> acc = 0;
long double phinc = -2.*k0* pi / timebuf.size();