diff --git a/apps/plugins/puzzles/puzzles.make b/apps/plugins/puzzles/puzzles.make
index 1041fde146..c855600e9d 100644
--- a/apps/plugins/puzzles/puzzles.make
+++ b/apps/plugins/puzzles/puzzles.make
@@ -10,29 +10,29 @@
 PUZZLES_SRCDIR = $(APPSDIR)/plugins/puzzles
 PUZZLES_OBJDIR = $(BUILDDIR)/apps/plugins/puzzles
 
-PUZZLES_SHARED_SRC := $(call preprocess, $(PUZZLES_SRCDIR)/SOURCES)
-PUZZLES_SHARED_OBJ := $(call c2obj, $(PUZZLES_SHARED_SRC))
+PUZZLES_SHARED_SRC = $(call preprocess, $(PUZZLES_SRCDIR)/SOURCES)
+PUZZLES_SHARED_OBJ = $(call c2obj, $(PUZZLES_SHARED_SRC))
 
-PUZZLES_GAMES_SRC := $(call preprocess, $(PUZZLES_SRCDIR)/SOURCES.games)
-PUZZLES_GAMES_OBJ := $(call c2obj, $(PUZZLES_GAMES_SRC))
+PUZZLES_GAMES_SRC = $(call preprocess, $(PUZZLES_SRCDIR)/SOURCES.games)
+PUZZLES_GAMES_OBJ = $(call c2obj, $(PUZZLES_GAMES_SRC))
 
-PUZZLES_SRC := $(PUZZLES_GAMES_SRC) $(PUZZLES_SHARED_SRC)
-PUZZLES_OBJ := $(call c2obj, $(PUZZLES_SRC))
+PUZZLES_SRC = $(PUZZLES_GAMES_SRC) $(PUZZLES_SHARED_SRC)
+PUZZLES_OBJ = $(call c2obj, $(PUZZLES_SRC))
 
-PUZZLES_ROCKS := $(addprefix $(PUZZLES_OBJDIR)/sgt-, $(notdir $(PUZZLES_GAMES_SRC:.c=.rock)))
+PUZZLES_ROCKS = $(addprefix $(PUZZLES_OBJDIR)/sgt-, $(notdir $(PUZZLES_GAMES_SRC:.c=.rock)))
 
 OTHER_SRC += $(PUZZLES_SRC)
 ROCKS += $(PUZZLES_ROCKS)
 
-PUZZLES_OPTIMIZE := -O2
+PUZZLES_OPTIMIZE = -O2
 
 ifeq ($(MODELNAME), sansac200v2)
-PUZZLES_OPTIMIZE := -Os # tiny plugin buffer
+PUZZLES_OPTIMIZE = -Os # tiny plugin buffer
 endif
 
 # we suppress all warnings
 PUZZLESFLAGS =  -I$(PUZZLES_SRCDIR)/dummy					\
-		$(filter-out -O%,$(PLUGINFLAGS)) $(PUZZLESOPTIMIZE)		\
+		$(filter-out -O%,$(PLUGINFLAGS)) $(PUZZLES_OPTIMIZE)		\
 		-Wno-unused-parameter -Wno-sign-compare -Wno-strict-aliasing -w	\
 		-DFOR_REAL -I$(PUZZLES_SRCDIR)/src -I$(PUZZLES_SRCDIR) -include	\
 		$(PUZZLES_SRCDIR)/rbcompat.h