diff --git a/proto_package.go b/proto_package.go
index 7cb0e0c..199e061 100644
--- a/proto_package.go
+++ b/proto_package.go
@@ -445,6 +445,8 @@ func (p *ProtoPackage) isAvailable(h *alpm.Handle) bool {
 	}
 
 	buildManager.alpmMutex.Lock()
+	defer buildManager.alpmMutex.Unlock()
+
 	var pkg alpm.IPackage
 	switch {
 	case p.Srcinfo != nil:
@@ -458,14 +460,16 @@ func (p *ProtoPackage) isAvailable(h *alpm.Handle) bool {
 		res, err = cmd.Output()
 		if err != nil {
 			log.Warningf("error getting packages from pacsift for %s: %v", p.Pkgbase, err)
-			buildManager.alpmMutex.Unlock()
 			return false
 		} else if len(res) == 0 {
-			buildManager.alpmMutex.Unlock()
 			return false
 		}
-		if len(strings.Split(strings.TrimSpace(string(res)), "\n")) > 0 {
-			pacsiftLines := strings.Split(strings.TrimSpace(string(res)), "\n")
+
+		// workaround for https://github.com/andrewgregory/pacutils/issues/66
+		// TODO: remove once fixed
+		rRes := reReplacePacsiftWarning.ReplaceAllString(string(res), "")
+		if len(strings.Split(strings.TrimSpace(rRes), "\n")) > 0 {
+			pacsiftLines := strings.Split(strings.TrimSpace(rRes), "\n")
 
 			var splitPkgs []string
 			for _, line := range pacsiftLines {
@@ -478,11 +482,9 @@ func (p *ProtoPackage) isAvailable(h *alpm.Handle) bool {
 			pkg, err = dbs.FindSatisfier(splitPkgs[0])
 		} else {
 			log.Warningf("error getting packages from pacsift for %s", p.Pkgbase)
-			buildManager.alpmMutex.Unlock()
 			return false
 		}
 	}
-	buildManager.alpmMutex.Unlock()
 	if err != nil {
 		log.Debugf("error resolving %s: %v", p.Pkgbase, err)
 		return false
diff --git a/utils.go b/utils.go
index 7df8246..15b2134 100644
--- a/utils.go
+++ b/utils.go
@@ -36,21 +36,22 @@ const (
 )
 
 var (
-	reVar                  = regexp.MustCompile(`(?mU)^#?[^\S\r\n]*(\w+)[^\S\r\n]*=[^\S\r\n]*([("])([^)"]*)([)"])[^\S\r\n]*$`)
-	reEnvClean             = regexp.MustCompile(`(?m) ([\s\\]+) `)
-	rePkgRel               = regexp.MustCompile(`(?m)^pkgrel\s*=\s*(.+)$`)
-	rePkgFile              = regexp.MustCompile(`^(.+)(?:-.+){2}-(?:x86_64|any)\.pkg\.tar\.zst(?:\.sig)*$`)
-	reLdError              = regexp.MustCompile(`(?mi).*collect2: error: ld returned (\d+) exit status.*`)
-	reDownloadError        = regexp.MustCompile(`(?m)^error: could not rename .+$`)
-	reDownloadError2       = regexp.MustCompile(`(?m)^error: failed retrieving file '.+' from .*: The requested URL returned error: .+$`)
-	rePortError            = regexp.MustCompile(`(?m)^OSError: \x5bErrno 98\x5d Address already in use$`)
-	reSigError             = regexp.MustCompile(`(?m)^error: .*: signature from .* is invalid$`)
-	reRustLTOError         = regexp.MustCompile(`(?m)^error: options \x60-C (.+)\x60 and \x60-C lto\x60 are incompatible$`)
-	reReplaceSinglePlus    = regexp.MustCompile(`(?m)([a-zA-Z0-9]+)\+([a-zA-Z]+)`)
-	reReplaceRemainingPlus = regexp.MustCompile(`(?m)\+`)
-	reReplaceSpecialChars  = regexp.MustCompile(`(?m)[^a-zA-Z0-9_\-.]`)
-	reReplaceUnderscore    = regexp.MustCompile(`(?m)[_\-]{2,}`)
-	reReplaceTree          = regexp.MustCompile(`(?m)^tree$`)
+	reVar                   = regexp.MustCompile(`(?mU)^#?[^\S\r\n]*(\w+)[^\S\r\n]*=[^\S\r\n]*([("])([^)"]*)([)"])[^\S\r\n]*$`)
+	reEnvClean              = regexp.MustCompile(`(?m) ([\s\\]+) `)
+	rePkgRel                = regexp.MustCompile(`(?m)^pkgrel\s*=\s*(.+)$`)
+	rePkgFile               = regexp.MustCompile(`^(.+)(?:-.+){2}-(?:x86_64|any)\.pkg\.tar\.zst(?:\.sig)*$`)
+	reLdError               = regexp.MustCompile(`(?mi).*collect2: error: ld returned (\d+) exit status.*`)
+	reDownloadError         = regexp.MustCompile(`(?m)^error: could not rename .+$`)
+	reDownloadError2        = regexp.MustCompile(`(?m)^error: failed retrieving file '.+' from .*: The requested URL returned error: .+$`)
+	rePortError             = regexp.MustCompile(`(?m)^OSError: \x5bErrno 98\x5d Address already in use$`)
+	reSigError              = regexp.MustCompile(`(?m)^error: .*: signature from .* is invalid$`)
+	reRustLTOError          = regexp.MustCompile(`(?m)^error: options \x60-C (.+)\x60 and \x60-C lto\x60 are incompatible$`)
+	reReplaceSinglePlus     = regexp.MustCompile(`(?m)([a-zA-Z0-9]+)\+([a-zA-Z]+)`)
+	reReplaceRemainingPlus  = regexp.MustCompile(`(?m)\+`)
+	reReplaceSpecialChars   = regexp.MustCompile(`(?m)[^a-zA-Z0-9_\-.]`)
+	reReplaceUnderscore     = regexp.MustCompile(`(?m)[_\-]{2,}`)
+	reReplaceTree           = regexp.MustCompile(`(?m)^tree$`)
+	reReplacePacsiftWarning = regexp.MustCompile(`^warning:.*\n`)
 )
 
 type Conf struct {