1 files changed, 5 insertions, 0 deletions
diff --git a/Alc/effects/modulator.c b/Alc/effects/modulator.c
index 0a8a4512..0bfca76c 100644
--- a/Alc/effects/modulator.c
+++ b/Alc/effects/modulator.c
@@ -37,6 +37,11 @@ typedef struct ALmodulatorStateFactory {
 static ALmodulatorStateFactory ModulatorFactory;
 
 
+typedef struct {
+    ALfloat coeff;
+    ALfloat history[2];
+} FILTER;
+
 typedef struct ALmodulatorState {
     DERIVE_FROM_TYPE(ALeffectState);