diff --git a/plugins/LadspaEffect/swh/imp_1199.c b/plugins/LadspaEffect/swh/imp_1199.c
index ec1b35028..05a59c565 100644
--- a/plugins/LadspaEffect/swh/imp_1199.c
+++ b/plugins/LadspaEffect/swh/imp_1199.c
@@ -74,7 +74,11 @@ static fftw_real *real_in, *real_out, *comp_in, *comp_out;
 
 unsigned int fft_length[IMPULSES];
 
+#ifdef __clang__
+void impulse2freq(int id, float *imp, unsigned int length, fftw_real *out)
+#elif
 inline void impulse2freq(int id, float *imp, unsigned int length, fftw_real *out)
+#endif
 {
   fftw_real impulse_time[MAX_FFT_LENGTH];
 #ifdef FFTW3