diff --git a/aegisub/configure.in b/aegisub/configure.in
index e4a83ef08..447b0d2dd 100644
--- a/aegisub/configure.in
+++ b/aegisub/configure.in
@@ -26,7 +26,7 @@ m4_define([pkgconfig_required_version], [0.20])
 m4_define([wx_required_version], [2.9.2])
 m4_define([libass_required_version], [0.9.7])
 m4_define([ffms_required_version], [2.15])
-m4_define([fftw_required_version], [3.2])
+m4_define([fftw_required_version], [3.3])
 
 
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