diff --git a/plug-ins/file-fits/fits.c b/plug-ins/file-fits/fits.c
index b1ee485fb5..b4a8dbb433 100644
--- a/plug-ins/file-fits/fits.c
+++ b/plug-ins/file-fits/fits.c
@@ -36,6 +36,7 @@
 
 #include "config.h"
 
+#include <math.h>
 #include <string.h>
 #include <errno.h>
 
diff --git a/plug-ins/file-fits/meson.build b/plug-ins/file-fits/meson.build
index 2e93259f89..daf84d62fa 100644
--- a/plug-ins/file-fits/meson.build
+++ b/plug-ins/file-fits/meson.build
@@ -24,6 +24,7 @@ if cfitsio_dep.found()
                           dependencies: [
                            libgimpui_dep,
                            cfitsio_dep,
+                           math,
                           ],
                           install: true,
                           install_dir: gimpplugindir / 'plug-ins' / plugin_name)