diff --git a/cpu/cc26x2_cc13x2/osc.c b/cpu/cc26x2_cc13x2/osc.c
index dd9378b748..7e79275220 100644
--- a/cpu/cc26x2_cc13x2/osc.c
+++ b/cpu/cc26x2_cc13x2/osc.c
@@ -54,7 +54,7 @@ void osc_hf_source_switch(uint32_t osc)
     _hf_source_set(osc);
 
     /* Wait for the oscillator to be ready */
-    while (_hf_source_ready()) {}
+    while (!_hf_source_ready()) {}
 
     /* If target clock source is RCOSC, change clock source for DCDC to RCOSC */
     if (osc == OSC_RCOSC_HF) {