diff --git a/pkgs/development/tools/tora/default.nix b/pkgs/development/tools/tora/default.nix
index 74f1f22426f9..e0f335158ed1 100644
--- a/pkgs/development/tools/tora/default.nix
+++ b/pkgs/development/tools/tora/default.nix
@@ -47,7 +47,7 @@ mkDerivation {
     "-lssl"
   ];
 
-  NIX_CFLAGS_COMPILE = [ "-L${mysql.connector-c}/lib/mysql" "-I${mysql.connector-c}/include/mysql" ];
+  NIX_CFLAGS_COMPILE = [ "-L${mysql.connector-c}/lib/mysql" "-I${lib.getDev mysql.connector-c}/include/mysql" ];
 
   qtWrapperArgs = [
     ''--prefix PATH : ${lib.getBin graphviz}/bin''