diff --git a/sakura.spec b/sakura.spec
index 57c2158..fee9cc1 100644
--- a/sakura.spec
+++ b/sakura.spec
@@ -28,7 +28,7 @@ have a decent terminal emulator.
 
 %build
 find . -type f -name CMakeCache.txt -exec rm -rf {} \;
-%cmake CMAKE_C_FLAGS=%{optflags} .
+%cmake CMAKE_C_FLAGS="%{optflags}" .
 make VERBOSE=1 %{?_smp_mflags}