diff --git a/common/config-manager.cpp b/common/config-manager.cpp
index 4ecc0e467ca..3f02798f461 100644
--- a/common/config-manager.cpp
+++ b/common/config-manager.cpp
@@ -245,7 +245,7 @@ void ConfigManager::removeKey(const String &key, const String &dom) {
 	else if (_globalDomains.contains(dom))
 		_globalDomains[dom].remove(key);
 	else
-		error("Removing key '%s' from non-existant domain '%s'", key.c_str(), dom.c_str());
+		error("Removing key '%s' from non-existent domain '%s'", key.c_str(), dom.c_str());
 }
 
 
diff --git a/common/timer.h b/common/timer.h
index 91786aca10c..503bc9cbe25 100644
--- a/common/timer.h
+++ b/common/timer.h
@@ -54,7 +54,7 @@ public:
 
 	/**
 	 * Install a new timer callback. It will from now be called every interval microseconds.
-	 * The timer may be invoked from a seperate thread. Hence any timer code should be
+	 * The timer may be invoked from a separate thread. Hence any timer code should be
 	 * written following the same safety guidelines as any other threaded code.
 	 *
 	 * @note Although the interval is specified in microseconds, the actual timer resolution
diff --git a/sound/audiostream.h b/sound/audiostream.h
index 177848181c3..1febb110a30 100644
--- a/sound/audiostream.h
+++ b/sound/audiostream.h
@@ -53,7 +53,7 @@ public:
 	 * Returns the actual number of samples read, or -1 if
 	 * a critical error occured (note: you *must* check if
 	 * this value is less than what you requested, this can
-	 * happend when the stream is fully used up).
+	 * happened when the stream is fully used up).
 	 * For stereo stream, buffer will be filled with interleaved
 	 * left and right channel samples.
 	 *
diff --git a/sound/fmopl.cpp b/sound/fmopl.cpp
index 8d1f9526f15..a8e2a3c641e 100644
--- a/sound/fmopl.cpp
+++ b/sound/fmopl.cpp
@@ -991,7 +991,7 @@ void OPLResetChip(FM_OPL *OPL) {
 	OPLWriteReg(OPL, 0x04,0); /* IRQ mask clear */
 	for(i = 0xff; i >= 0x20; i--)
 		OPLWriteReg(OPL,i,0);
-	/* reset OPerator paramater */
+	/* reset OPerator parameter */
 	for(c = 0; c < OPL->max_ch ;c++ ) {
 		OPL_CH *CH = &OPL->P_CH[c];
 		/* OPL->P_CH[c].PAN = OPN_CENTER; */