diff --git a/raster/CMakeLists.txt b/raster/CMakeLists.txt
index aba8ff81fdd..4cba187b21f 100644
--- a/raster/CMakeLists.txt
+++ b/raster/CMakeLists.txt
@@ -524,7 +524,7 @@ build_program_in_subdir(
   OPTIONAL_DEPENDS
   OPENMP)
 
-build_program_in_subdir(r.sunhours DEPENDS grass_gis grass_raster grass_gproj)
+build_program_in_subdir(r.sunhours DEPENDS grass_gis grass_raster grass_gproj LIBM)
 
 build_program_in_subdir(r.sunmask DEPENDS grass_gis grass_raster grass_gproj LIBM)