diff --git a/Makefile b/Makefile
index 8b610ea5..0fa793cd 100644
--- a/Makefile
+++ b/Makefile
@@ -2881,7 +2881,7 @@ $(B)/$(MISSIONPACK)/vm/ui.qvm: $(MPUIVMOBJ) $(UIDIR)/ui_syscalls.asm $(Q3ASM)
 ## CLIENT/SERVER RULES
 #############################################################################
 
-$(B)/client/%.o: $(ASMDIR)/%.s
+$(B)/client/%.o: $(ASMDIR)/%.S
 	$(DO_AS)
 
 # k8 so inline assembler knows about SSE
@@ -2980,7 +2980,7 @@ $(B)/renderergl2/%.o: $(RGL2DIR)/%.c
 	$(DO_REF_CC)
 
 
-$(B)/ded/%.o: $(ASMDIR)/%.s
+$(B)/ded/%.o: $(ASMDIR)/%.S
 	$(DO_AS)
 
 # k8 so inline assembler knows about SSE
diff --git a/cmake/compilers/gnu.cmake b/cmake/compilers/gnu.cmake
index 9a00d3e4..22238f44 100644
--- a/cmake/compilers/gnu.cmake
+++ b/cmake/compilers/gnu.cmake
@@ -7,8 +7,10 @@ endif()
 enable_language(ASM)
 
 set(ASM_SOURCES
-    ${SOURCE_DIR}/asm/snapvector.c
     ${SOURCE_DIR}/asm/ftola.c
+    ${SOURCE_DIR}/asm/matha.S
+    ${SOURCE_DIR}/asm/snapvector.c
+    ${SOURCE_DIR}/asm/snd_mixa.S
 )
 
 add_compile_options(-Wall -Wimplicit
diff --git a/code/asm/matha.s b/code/asm/matha.S
similarity index 100%
rename from code/asm/matha.s
rename to code/asm/matha.S
diff --git a/code/asm/snd_mixa.s b/code/asm/snd_mixa.S
similarity index 100%
rename from code/asm/snd_mixa.s
rename to code/asm/snd_mixa.S